Motivation yes, but might need to consider the fact you might have to give one side up for interviews with the other, and then if you screw up that side, and want a chance with the other company, you might not have that chance again easily. That is just the way I see it.
I also like to see wannabes more firm on which airline to choose, not just for the love of flying. Hopefully people can expand on this point in this forum.