Well, I'm thinking of two situations:
1) I want to destroy one foreign airbase and not another one.
2) I want to destroy one of the bases at home (perhaps it is a foreign airbase that was moved back home and I no longer need) and keep a particular foreign airbase.
Yes, I have noticed that foreign airbases are deleted before home airbases. I actually had problems with this years ago and the GMs were nice enough to fix it.