Arriving TXL on BA, is there a ticket machine in the terminal where I can buy a day pass for public transport for the following day, using coins? I.e. where the ticket is not validated, and also as the bus driver won't appreciate me paying all in 10c
There might be long lines, both at the counter and the machines. You can get a daypass AB from every bus driver. Might be by far more convenient. Just tell him you want a Tageskarte AB ("A" pronounced more like "R").