I have a long business trip that flies in and out of the same city arriving late Sunday 2/1 and departing back home on Friday 2/13.

My question is, can I book a separate roundtrip flight in the middle of this trip for the weekend in the middle? I.e. A trip within a trip.

It's not really to get around any fares or anything, just to get away.

Of course, I want to earn miles and segments for this weekend trip... Which is only being planned because I've got nothing else better to do on the weekend then go visit a friend in a nearby city.

Thoughts?