Hello --

I have a $150 discount voucher (class A, I think) and a handful of other vouchers worth about $115 from airfare price drops between booking and flying (class B?). I'm told they should be combinable, so I'm trying to use them to book tickets from WAS to SFO around Memorial Day. Does anyone know whether, or how, I can use them to do an online booking, either through a corporate travel site I have access to with negotiated discounts built in or through United.com? I don't want to have to call the airline and pay a fee for using a regular reservations agent.

Alternatively, as a 2P, can I avoid the fee if I call the 2P member desk (the number for which I don't have yet, because United never sent me a package when I made 2P, but which I'm sure I can track down by calling them)?

Thanks.