I am seeing interesting things with using airports and trying to airlift units.
It seem that in order to be able to airlift any unit, that unit needs to have "ALL" of its movement points preserved. If on a railroad you venture even 1 tile from the city, that unit will no longer be available for airlift during that turn. This is regardless of the number of movement points available to the unit. I have seen this behaviour with pikeman, cavalry and fast worker.
The other anomaly I noticed is that an airport allows you to airlift 1 unit per turn. On the receiving end, a city can only receive 1 airlifted unit per turn.
Both of these are change in behaviour from previous Civs.
There is no documentation to suggest that this is how Airports and airlifts work.
It seem that in order to be able to airlift any unit, that unit needs to have "ALL" of its movement points preserved. If on a railroad you venture even 1 tile from the city, that unit will no longer be available for airlift during that turn. This is regardless of the number of movement points available to the unit. I have seen this behaviour with pikeman, cavalry and fast worker.
The other anomaly I noticed is that an airport allows you to airlift 1 unit per turn. On the receiving end, a city can only receive 1 airlifted unit per turn.
Both of these are change in behaviour from previous Civs.
There is no documentation to suggest that this is how Airports and airlifts work.