I agree with the others.. absolutely take the trip, and if called for an interview just let them know that you have an international trip planned over those days. Normally I would say it’s none of their business, and to just say that you have a prior obligation, however in this environment they make take that to mean that you have a different interview scheduled for those days.

Our candidate pool is not huge, and you meet all of the criteria, which means Alaska wants you. Take the trip, and schedule the interview either before or after the trip. Good luck!