Howdy all. Need to book an easy RT family trip (DEN-LAX), but though 3 sources. One tix cash, one tix from my ER account, and one from my wife's ER account. I'd usually do this online, but to link the PNR's, I think I'd have to contact Frontier. Can I book this all under one PNR by calling in? Would their be a ticketing fee? Thanks!