Whether you use a credit card or cash when you buy a ticket rarely adds suspicion. More likely it's who it is, and who they're travelling with. All FF
miles and service class conversations aside, a small, but significant part of the travelling public does not own credit cards, for whatever reason, and they still purchase tickets at a ticket counter with cash. I sold one last night 50 minutes before the flight left, a professional woman, who had been bumped off another airline two times. She paid with travellers checks. Suspicion to me is, again not how you pay, it's who is paying for it and who they're travelling with.
I was unaware that it was acceptable to use a student ID
card? As far as I know it does not meet the criteria, "government issued photo identification". It may supplement other ID
. I think it would be more uncommon, and suspicious to have that as your only ID
, than paying with cash, unless you are only 17 years old.