Interline Travel: ZED Fares and the Rest of the Sky

ZED stands for Zonal Employee Discount — a multilateral agreement that most of the world's airlines participate in, standardizing how they sell standby tickets to each other's employees. Fares are priced by distance zone, not by market fare, so your cost is flat, predictable, and completely disconnected from what everyone else on the plane paid.

Somewhere in your first months of non-rev life, a realization hits: your own airline doesn't fly everywhere. Maybe it doesn't fly to Tokyo. Maybe it flies to Tokyo but only via a hub that's chaos in summer. Maybe you just want to come home a different way than you left.

Good news: your benefits don't end at your airline's route map. Through a web of agreements between carriers, you can fly standby on airlines that have never heard of you, don't employ you, and owe you nothing — for prices that would make a paying passenger weep. This is interline travel, and mastering it turns your staff benefits from "cheap trips on one airline" into "the entire planet, at a discount."

It also comes with a demotion. Remember the priority post: on someone else's metal, you're a guest, and guests eat last. Keep that in mind through everything that follows.

What ZED actually is

As mentioned before, ZED stands for Zonal Employee Discount — a multilateral agreement that most of the world's airlines participate in, standardizing how they sell standby tickets to each other's employees.

Before ZED existed, interline staff travel was a jungle of one-off bilateral deals, each with its own paperwork and pricing. ZED replaced that mess with one elegant idea: price by distance zone, not by market fare. The world's routes are grouped into distance bands, and each band has a fixed, modest fare. It doesn't matter that the commercial ticket costs €80 one day and €600 the next — the ZED fare for that route is the ZED fare, full stop.

The result is that your cost of flying another airline is predictable, flat, and delightfully disconnected from what everyone else on the plane paid.

ZED Low, Medium, and High

Not every airline pair charges the same, though. Within the ZED framework, each pair of airlines agrees on one of three fare levels:

Here's the strategic bit most new non-revs miss: the fare level depends on the pair of airlines, not the route. Two different carriers flying the exact same city pair can cost you meaningfully different amounts, because your employer's agreement with Airline A is ZED Low and with Airline B is ZED High. On a long-haul trip, the difference can be the price of a hotel night. Always compare before you book — the same journey has multiple prices depending on whose plane you pick.

And there's a second layer of fine print: the fare level can differ depending on who is traveling — even within your own family. Agreements often set different levels for different categories of traveler. You, the employee, might fly Airline A at ZED Low while your parents on the very same flight pay ZED High — or aren't covered by the agreement at all and can't come along on that carrier, period. Never assume that a price you found for yourself applies to everyone in your group. When planning family trips OAL, check the fare level per traveler category, because a route that's a bargain for you alone can turn expensive — or partially impossible — once the whole family is in the booking.

On top of the base fare, you'll pay taxes, airport charges, and sometimes surcharges — more on that in the money section below.

The other fares: ID90 and friends

ZED is the backbone of interline travel, but you'll also meet the older family of ID fares — industry discounts expressed as a percentage off a commercial fare:

ID90 — 90% off. ID75 — 75% off. ID50 — half price. And so on.

The critical distinction isn't the number — it's whether the fare is standby or confirmed. Some ID fares are standby, functionally similar to ZED. But some are confirmed: a real, guaranteed seat, at a deep staff discount. Confirmed ID fares (where available to you) are the secret weapon for trips that must happen — the wedding, the exam, the cruise departure. You give up the rock-bottom price; you buy back certainty.

Which brings up a comparison worth doing every single time: staff fare vs. just buying a ticket. On short routes, a ZED High fare plus taxes can land surprisingly close to what a budget carrier charges for a confirmed seat — and the budget carrier seat is guaranteed. A discount is not automatically a deal.

But compare like with like, because the sticker prices are playing different games. A staff ticket almost always behaves like a full-service fare: cabin bag and checked luggage typically included, no seat-selection fees, none of the à-la-carte nickel-and-diming. That €60 budget-carrier fare, meanwhile, is the price of a seat and a small bag under the seat in front of you — add a cabin bag, a checked suitcase, and suddenly it's $130 and the "expensive" standby ticket is the cheap option again. So run the numbers with honest eyes and a complete shopping cart: total cost of the staff fare versus total cost of the commercial ticket with everything you actually need. Traveling light for a weekend? The guaranteed budget seat may genuinely win. Two weeks of luggage for a family of four? The comparison usually swings hard back toward the staff fare — risk and all.

Who you can fly with - and how to find out

Your interline options are defined by which agreements your airline holds. Most carriers maintain agreements with dozens of others — but not all, and the gaps can surprise you (commercial rivalries, regional politics, or simple paperwork lapses all play a role). Some agreements cover employees only; others extend to your spouse, kids, or parents; some cover standby only while others include confirmed fares. And agreements change — carriers join, lapse, and renegotiate levels.

Cabin class is part of the fine print too. Agreements don't just define whether you can fly an airline — they define which cabin you're allowed to sit in. Some agreements include both economy and business class; others are economy-only, no matter how empty the pointy end is. And just like fare levels, cabin eligibility can differ by traveler category: it's common for an agreement to allow business class for the employee but economy-only for parents or buddy travelers — while at other airlines the whole eligible family can go up front. So that daydream of the whole family stretched out in business on someone else's airline needs a fact-check against the agreement first. (Note this is only about what you're allowed to list for — whether business actually clears for an OAL standby is a separate battle.)

Your airline publishes the current list — usually somewhere in the staff travel portal, often as a table showing each partner airline, the fare level, who's eligible, which cabins are included, and any special conditions. Before you dream up an itinerary on another carrier, check four things:

1. Does the agreement exist?
2. What level is it?
3. Does it cover everyone I'm traveling with?
4. Which cabin can each of us actually book?

More than one family trip has died at the booking stage because the agreement covered the employee but not the kids.

How interline booking actually works

Most interline standby travel today is booked through myIDTravel, a platform shared by a large chunk of the industry, which handles the search, the payment, and the listing in one place. It's important enough — and quirky enough — that it gets an entire post to itself.

But not everything lives there. Some airlines handle interline listings through their own websites or dedicated listing links; a few still do it the old way, at the airport ticket counter, with your employee ID and a patient smile. Your airline's agreement list usually tells you which method applies to which partner. For now, just know the shape of the process: you buy a ticket, you create a listing, and then you show up and take your chances like any standby — except lower on the list, as we're about to revisit.

The demotion, revisited

This is the part of interline travel that no fare table shows, and it changes everything about how you plan.

On your own airline, you're somewhere respectable in the pecking order. The moment you step onto another carrier as a ZED traveler, you drop to the OAL tier — below their employees, below their retirees, below their employees' families, sometimes below things you didn't know existed. And as the priority post covered, how that OAL pool clears varies by airline: some rank OAL travelers on their grand unified list, many others dump everyone into one pool cleared by check-in time. The seniority that serves you at home means precisely nothing at another airline's gate.

The practical consequences:

Loads that look fine for you at home are not fine OAL. A flight showing 15 open seats might comfortably board you on your own airline. On another carrier, those 15 seats first feed their own standbys — commuting crew, staff families, retirees — and the OAL pool gets the leftovers. Experienced interline travelers mentally discount open seats accordingly and want genuinely light loads before committing.

Popular staff routes are a trap. The routes airline employees love — hub to beach destination, hub to hometown — carry a permanent cloud of that airline's own standbys who all outrank you. The commercially unglamorous flight often clears an OAL traveler more easily than the famous one.

Check-in speed matters double. If the OAL pool clears by check-in time, being early is the only lever you have. Find out the earliest moment you can check in or list, and be there.

None of this makes interline travel bad — it makes it a different sport. Played well, it's how non-revs reach the whole map. Played naively, it's how they get stranded at a foreign hub, which is why the planning post leans so heavily on backup routings whenever OAL segments are involved.

What a ZED ticket costs, honestly

Time for the money reality check, because "the ZED fare" is never the number you actually pay.

Your total is: base ZED fare + taxes + airport charges + any surcharges. The base fare is the cheap, flat, zone-based part. The taxes and charges are whatever the governments and airports involved demand — and on some routes they exceed the fare itself (ekhm London Heathrow). Certain carriers also add fuel or carrier surcharges to staff tickets, which can turn a nominally cheap ZED into a mediocre deal on specific routes.

The good news hiding in the fine print: a fully unused ZED ticket is generally refundable. Plans collapsed, you flew a different routing, the trip never happened — that ticket is money waiting to be reclaimed, usually via a refund request through the platform you booked on. Keep a note of every ticket you buy and don't use; future-you will appreciate it.

One caveat for the confirmed staff fares: airlines that offer them often attach cancellation deadlines — the ticket must be cancelled a certain time before departure to qualify for a refund (or to avoid a penalty). Miss the cutoff, or simply no-show, and the money can be gone, and some airlines treat repeated no-shows on confirmed staff tickets as a benefits-abuse issue on top of it. So a confirmed staff ticket needs a small mindset shift: unlike your standby tickets, it comes with a commitment — put the cancellation deadline in your calendar the moment you book. (Partially used tickets are messier — abandoning an outbound usually complicates or kills the return — and we'll deal with that in the myIDTravel post.)

One habit to build now

If you take a single behavior from this post, make it this: when planning any trip, check the interline options alongside your own airline's routes — every time.

Your own carrier's network is the comfortable default, but it's rarely the whole answer. Sometimes another airline flies the route with better loads. Sometimes a ZED Low partner gets you there cheaper than your own airline's taxes would. Sometimes the smart play is your own metal outbound and an OAL routing home. The non-revs who treat the entire sky as their network — rather than just their employer's — are the ones whose trip reports make everyone else jealous.

The tool where most of that sky becomes bookable is myIDTravel: part booking site, part listing system, part occasional source of despair. Let's learn to drive it.