Agree with hapzim
Always found staff travel more trouble than its worth -especially if you are way down the seniority list.
For two weeks leave you can spend a couple of days trying to get on the flight and after 10 days have to think about getting back. All takes a bit of fun out of the holiday for me. And worse if you do it with wife kids etc.
Plenty of confirmed seats and holidays around that give a more stree free hol