Originally Posted by
Explorer789
I've never heard of any airline ask for payment verification at checkin.
You have now!
BA used to do this more than it does now. It was actually quite routine for a while when online bookings began to be offered. Then there was a phase when certain passenger characteristics (eg higher-tier BAEC membership) would tend to exempt you from the check - although that wasn't universal and I remember one occasion when I was the last person of the group of three to arrive at the airport and BA simply wouldn't print BPs for the other two until I'd got there. Now, it's unusual for me to be asked, but it still sometimes happens - particularly with Comair in South Africa.
About 10 years ago, I booked a ticket for a friend on CX to fly from HKG to somewhere like NRT. The way that our plans evolved, I ended up departing HKG earlier than she did, taking the credit card with me. She found that she couldn't travel without paying CX again for the ticket with her card, with me getting a refund afterwards.