Collecting airlines: how to keep your airline list and close the gaps

At some point it is no longer enough to just bring home nice photos. Then the question starts: How many airlines have I actually seen already – and which ones am I still missing? Collecting airlines is one of the oldest forms of plane spotting and works at any airport, from a small regional field to a hub. This guide shows you how to set counting rules, how a clean airline list is built and how to close the gaps in it on purpose instead of waiting for chance.

Collecting airlines: the short answer

A good airline collection stands on three legs: a fixed counting rule, a clean list with a unique key and a plan for the gaps. The counting rule defines what counts as a “new airline” in the first place. The list records every first sighting with date, place and registration. And the plan tells you at which airport, at what time and on which weekday the missing carriers show up.

That sounds like bureaucracy, but it saves you trouble. If you start without a rule, after a few months you face questions like: Does Eurowings count separately even though the aircraft was flown by another company? Is Malta Air its own airline even though the aircraft looks like a Ryanair? The sooner you answer these questions, the less you have to clean up later.

What counts as an airline? The counting rule

You make the most important decision before the first line. There are three sensible collecting levels, and each has its own logic.

Collecting level	What you count	Example	Advantage	Drawback
Operator	The company that actually flies the aircraft	Ryanair DAC and Malta Air separately	unambiguous via the ICAO code, easy to verify	identical-looking aircraft count multiple times
Brand	The name under which tickets are sold	“Ryanair” once, no matter who flies	intuitive, close to what you perceive at the fence	wet leases and group subsidiaries blur
Livery	Visible design, including special liveries	Retro or alliance livery separately	very photographic, endlessly expandable	hardly comparable, no fixed upper limit

For the main list, many collectors have settled on the operator. The reason is practical: Every operator generally has its own ICAO code, and you can verify it via flight trackers, radio or registration. How IATA and ICAO codes are built and where to find them is explained in the article IATA and ICAO codes explained.

An example makes the difference clear: Under the Ryanair brand, several companies of the group fly, including Ryanair DAC (ICAO RYR), Malta Air (MAY), Buzz (RYS) and Ryanair UK (RUK). For the operator list those are four different entries, for the brand list one. It is similar with groups such as the Lufthansa Group, in which besides Lufthansa also SWISS, Austrian, Brussels Airlines, Eurowings and Lufthansa City Airlines operate as separate operators.

Special cases you have to decide once

• Codeshare: Never counts. The additional flight numbers on the departures board say nothing about who flies. More in the article Codeshare flights explained.
• Wet lease: What counts is the operator that provides aircraft and crew. The airline it flies for, you note as a remark. Background is in the guide Wet lease explained.
• Hybrid liveries: If an aircraft after a change still flies half in old colors, the current operator still counts. How to recognize such cases is described in the article Recognizing hybrid liveries.
• Renamings: If an operator keeps its code and only changes its name, it is the same airline under the operator rule. If it gets a new certificate and a new code, it is a new one.
• Seen or photographed: Decide whether a reliably identified sighting is enough or whether you need a photo of your own.

How to build your airline list

Whether you write in a notebook, a spreadsheet or an app is secondary – the article Logbook: paper or digital compares the pros and cons. What matters is that every row has the same fields. The following structure has proven itself:

Field	Content	Why it helps
ICAO code	three-letter operator code	unique key, prevents duplicates
Name	official name of the operator	readable, also for others
Country	operator’s home country	analysis by country and continent
First sighting	date of the first sighting	shows progress over time
Airport and spot	where you first saw it	shows which places paid off
Registration and type	the specific aircraft	proof and link to the fleet list
Status	active, historical, renamed	honest classification after years
Remark	wet lease, special livery, photo yes/no	context for later doubtful cases

The registration is more than diligence work here. Through the country prefix, it often tells you which operator is flying when the livery does not do so unambiguously. How the prefixes are built is shown in the articles Understanding aircraft registrations and Aircraft country codes. And if you note registrations anyway, you have already laid the foundation for a second collection – more in Collecting registrations.

If you keep your list in a spreadsheet, the guide Spotting logbook in Excel or Google Sheets helps you set up columns, filters and counting formulas. The big picture around logbooks is in the article Logging sightings.

The target list: knowing what is missing in the first place

A list of what you have seen is only half the battle. It gets really interesting with a target list: all airlines you can realistically catch at a particular airport. Only comparing both lists shows you your gaps.

You build a target list in four steps:

A popular goal is the three big alliances. Which airlines belong to Star Alliance, oneworld and SkyTeam is publicly documented – that makes them a well-defined collecting task. The article Star Alliance, oneworld and SkyTeam gives an overview.

You can work out your progress quickly here:

Why you are always missing the same airlines

The first entries come on their own. If you spend a few weekends at a larger airport, you quickly have the frequent companies together. The last gaps, on the other hand, almost always follow the same patterns:

• Rare frequency: Some airlines come only once to three times a week. If you always spot on Saturdays, you miss a connection that flies on Tuesdays and Thursdays.
• Wrong time of day: Many long-haul flights land in central Europe in the early morning and depart in the late morning or evening. When what typically arrives is described in the article Long-haul arrival times in Europe.
• Night and cargo traffic: Cargo airlines and express integrators often fly at off-peak times. If you only stand at the observation deck during the day, you never see them. The guide Recognizing freighters helps with identification.
• Wrong airport: Many airlines serve only one hub in Germany. What is everyday in Frankfurt may never come by in Hamburg.
• Season and charter: Leisure airlines, special flights to major events and ad hoc charters show up only at certain times.
• Wet leases and fill-ins: When an airline is short of aircraft, other operators step in. These opportunities are short-lived and unpredictable.

Closing gaps on purpose: three levers

Lever 1: Choose the right airport

The biggest leap in a collection almost always comes from a change of location. A hub such as Frankfurt Airport often brings you more airlines in a single day than a regional airport in a month. From the Zeppelinheim viewing platform, with a west wind you see a large share of the landings on the southern runway, including many widebody jets from all over the world. Munich Airport or the Düsseldorf observation deck also bring different airline mixes than your home airport.

Large European hubs where airlines land that do not serve Germany at all are also worthwhile. You will find tips for the spotting places there in the Schiphol guide or the Heathrow guide. And sometimes the vacation itself becomes a collecting trip – how that works without stress with the family is described in Plane spotting on vacation.

Lever 2: Hit the right time

Once it is clear which airline is missing and where it lands, it comes down to weekday and time. Schedules, flight tracker history and the airport’s arrivals board help here. How to look up which flights an airline operated in recent days is in the guide Looking up an aircraft’s flight history. At hubs, a look at the connection waves is also worthwhile: The article Understanding hub waves explains why traffic bunches up at certain times.

Lever 3: Get notified

For the really rare visitors – wet lease operators, special flights, charters – planning alone is not enough. Alerts that tell you as soon as a particular airline is on approach help here. How to set up such notifications on common flight trackers is shown in the article Setting up flight tracking alerts. How rare a visitor actually is, you can judge with the guide Judging the rarity of a sighting.

Is the trip worth it for a single airline?

Not every gap justifies a long trip. A simple weighing helps:

Historical airlines and finiteness

Airlines disappear – through insolvency, merger or a group restructuring. European aviation has lost many well-known names in recent decades; the article Major airline collapses in Europe gives an overview, and a prominent example is Air Berlin. If you still have Air Berlin on your list, you caught it in time – that entry can no longer be made up today.

That is why: If the end of an airline or a route is announced, it moves up your wish list. The same goes for group restructurings in which operators are merged. A current example is Lufthansa CityLine, which, according to the Lufthansa Group, has had no operation of its own since April 2026. In your list you mark such entries as historical, but never delete them.

Analyzing the list

After some time, your list becomes a data source. A few analyses are especially worthwhile:

• New airlines per airport: Shows you which place has paid off most for the collection – and where another visit is hardly worth it.
• Airlines by country or continent: Makes visible where your collection is thin. If you are missing companies from Asia, for example, the way usually leads through a large hub.
• First sightings per year: When the curve flattens, you have captured the base stock of your region. From now on, travel brings the progress.
• Linking with types and registrations: If you also collect aircraft types or tick off whole fleets, the airline list is the perfect entry point.

How to turn this into an annual review is shown in the articles Analyzing spotting statistics and Creating your own spotting annual review.

What to watch for

• Do not change the rules retroactively. If you switch the counting rule, recheck the whole list. Otherwise two systems get mixed.
• When in doubt, verify. Identical-looking liveries within a group are the most common source of error. Registration and tracker settle almost every case – more on databases in the guide Using Planespotters.net.
• Stay on public areas. No gap is worth climbing over barriers. What is allowed is in the article Is plane spotting allowed?.
• Collecting is not a race. There is no official ranking. Your list is your archive – compare yourself at most with yourself from last year.

Conclusion

Collecting airlines is more than ticking boxes. With a clear counting rule, a unique key such as the ICAO code and a target list, loose sightings become a collection you can analyze and expand on purpose. The frequent companies come on their own. For the last gaps, you need the right airport, the right weekday and sometimes an alert that gets you to the fence in time.