Does "cash only" mean "Cash. Only!" ?
Today on my flight home I was in coach (DM B fare, 3 on the list) in an aisle seat. The lady next to me wanted to use the bathroom and I decided I could use a drink, so I walk back to the galley where the two flight attendants are chatting and they hand me the bottle and a can and say "7 dollars" - I go to hand him my amex and he says they'll only take cash. I was a little surprised as I hadn't seen anyone pay cash for a drink in a very long time, I didn't want to question them as I don't really care, but it seemed really irregular and when I paid with a 10 he made change using his personal wallet.
strange? normal?