Join Date: Dec 2001
Location: State of Denial
Programs: UA LifetimeGS, DL LifetimePM, HH Dia, Bonvoy Ambassador, IHG Plat, Avis Chairman, Hertz Plat
Posts: 94
I've not done this with UA but a few times with other airlines. Never had a problem. Only concern would be if you had a tight connection and the itineraries are not tied.
Then again, the policies on holding flights for connections is very cloudy to me...