I was in the same situation a year or so ago with the Flybe/Cityflyer assessments. The PILAPT testing isn't transferable between the two, but does last for a number of months. I was in the situation where I didn't pass a Flybe interview, but was able to come back 6 months later and take it again. I was told each airline wants to see good marks across the board for all their assessment stages exclusively. They aren't interested in what you have done with a competitor airline, even if the tests are the same. If you have two "live" applications open, then you are asked to pick one. So say Flybe interview comes first and you have an open application with BACF, then you either withdraw from the Flybe process and hope for an interview with BACF or drop BACF and carry on with FlyBe. This is all at FTE's discretion however, and it is worth asking the question directly to their selection team. I always found them to be very open and helpful.