score:0
I'll summarize the answers the question received in the comments: 1) it is expensive for the airline to sell tickets at the airport 2) some paperwork has to be done a fair amount of time before the flight departs.
- At some point the paperwork has to get started, including how much belly cargo etc can be taken, how many standby passengers have a chance, upgrades etc Moo 10 hours ago
- Selling in-person requires infrastructure and personnel that low-cost carriers don't want to spend money on. littleadv 5 hours ago