Originally Posted by
DaveReidUK
It also explains why cabbies aren't exactly thrilled when you get in their cab at one of the Heathrow terminals and say "Hounslow, please".

it used to be the case that if they got a “short” fare they got a pass that let them skip the majority of the queue and come back to the front. But that was some time ago and I’m not sure on the exact range or if this still happens.
back to the original question, yes I heard on the grapevine (maybe on this forum….?j that SEN airport agreed a charge/commission per train user that the train company would pay the airport, ( can’t recall the amount.) trouble was all the local commuters started using the station too and the train company got caught out and wanted to pay less on the agreement, or so the story goes.
a similar discussion over who pays for the station and who gets the ticket revenue is partly why there’s no cross rail station for LCY. I think the airport got a bit stung with the DLR previously although long term it was money well spent.