I have looked at the DB and the airports table has no column for airline code on each airport, so my solution is to categorize them by country and simply change the caption to the airline name.(ex. If HUB country = 'USA' then show 'TST- Airline HUB' before the airports.)
Another way I can think of is to add a column to the DB and a field to the airport add form in admin to insert an airline code into the DB column and then categorize them accordingly but it requires changing phpvms original files.