Every airline is your first choice. You work for whoever hires you. Very few folks get more than one offer so treat every interview like that's the one. Not everyone is fortunate enough to get their first choice all though life, unless you are F15cricket. lol
The hiring board folks don't have x-ray mind readers and they can't really tell if you are lying unless you are too stupid to play the game; you must play to win. If you are weak in this area, go invest in an interview prep.
Alaskan was my first choice over a decade ago but that was then and times have changed. If I were looking for a job today, Alaskan would be the last of the "desired" airlines to work for. Some of the pea minded Alaskan egomaniacs on here will have a tizzy with what I just said. In this job market, you look out for number 1.