In the early to mid 90's, somehow when I wasn't looking I became the Xhief Pilot of Baltic International Airlines...(now Air Baltic)...
Our 2 steady routes were Riga/Frankfurt and Riga/Gatwick 7 days a week...
We operated a TU-134 and 2 ex-AA 727-100's...An issue came up, and I don't know what it was, but we could fly to Gatwick with the Tu-134, and one of the Boeings....no problem...but if the other Boeing ever reared her head in the UK, she would be siezed...
Not sure I understand this one...if my company owes you money, what does it matter which A/C you block....?