Join Date: Mar 2015
Location: NYC (Primarily EWR)
Programs: UA 1K / *G, ALL Accor Diamond, IHG Platinum Elite, Marriott Bonvoy Gold, Avis PC, Hertz PC
Posts: 10,636
I use miles + copay all the time - I have only ever flown in paid J (i.e. bought as an outright fare) once.