Getting called for an interview ...how many apply and how many get asked to come?

I had the same type of decision years ago (1979). I had been in training with FedEx for two weeks and got called back to United for my final interview. I believe they had you come in a total of four times back then. The word was that the final was just to say congradulations and tell you when to attend training. Lucky for me I made the correct decision.

I can't offer any advice really.

Good Luck...