Airside
Everything past security
-
What you can actually carry in hand luggage
How much you can bring is decided by the fare. What you can bring is decided by security, customs and the aircraft, and those three do not always agree.
-
What the meal service actually is
Whether there is food, whether it costs anything and whether it resembles what you ordered are three different questions with three different answers.
-
Travelling with a pet, and the questions to settle first
Whether an animal can fly at all is decided by the route, the breed and the paperwork, and each of those is settled somewhere other than the airline.
-
How to choose a seat, and when it stops mattering
Most of what a seat is like was decided by the fare, the aircraft and the row number, long before anyone opened the seat map.