I've heard about various airlines that will upgrade from Economy to Business at the airport or onboard for cash, if seats are available. I've never tried this before, but for an upcoming trip, I can't seem to find J award space for required dates, and revenue seems over my budget at this point.
Which airlines will allow onboard upgrade, and where are chances good? What's the best strategy?
TK?
SU?
PS?
Any others on NYC-TLV-NYC routes?