Routes are withdrawn regularly, and often the cancelled service was not losing money. The decision rests on what the aircraft could earn somewhere else instead.
Routes are judged per aircraft per day
An airline's scarcest asset is a serviceable aircraft with a crew attached. Every route is measured by what it returns for the hours it occupies that asset.
A route can cover its costs comfortably and still be cut, because another route would cover them better. The comparison is against alternatives, not against zero.
This is why cancellations cluster when a fleet is constrained. Delivery delays or maintenance groundings force the network into its highest-yielding options only.
Seasonality masks weak performance
Many routes make their entire annual return in a few months and lose money for the rest of the year, which is invisible in an annual figure.
Airlines increasingly respond by flying the route only during its strong season rather than dropping it outright. The service becomes seasonal instead of disappearing.
For passengers this reads as a cut, but it usually reflects an attempt to keep the route alive in the only form that works.
Slots and airport charges constrain the choice
At congested airports the right to take off at a given time is itself scarce, and using it on a weak route carries a real opportunity cost.
Slots are also difficult to reclaim once given up, so airlines are reluctant to withdraw entirely even from routes that underperform.
The compromise is frequency reduction. Holding a daily service where two existed keeps the slot position while cutting the exposure roughly in half.
Support arrangements change the arithmetic
Airports and regional authorities frequently offer reduced charges or marketing support to attract a route, which alters whether that route is viable at all.
These arrangements run for a fixed term. When they expire the route has to stand on its own performance, and a share of new services do not survive that transition.
This explains why routes are sometimes cancelled after two or three apparently successful years. The economics changed, not the passenger numbers.
Withdrawal is rarely announced as failure
Public statements usually cite fleet redeployment or network review rather than weak demand, partly to protect the relationship with the airport concerned.
The language matters because the airline may want to return later, and a route framed as a strategic reallocation is easier to restart than one declared unprofitable.
Watching what replaces the cancelled service is the more informative signal. The aircraft almost always reappears somewhere the airline expects to do better.