Comment by devilbunny

And they require a boarding pass. Which can’t be changed without the airline’s permission.

Back in the old days, sales like this were common. No ID checks, non-passengers allowed through security, and the classified ads in newspapers would say “round-trip coach ticket May 8-12 JFK to SFO, male name, call 212-555-1234”. So you met them, got your paper ticket, got a boarding pass at the counter or the gate, and flew.