Assertion: airline | /r/CapableOf | sell upgrade
Facets:
value: through an auction mechanism
type: MANNER
Source sentences:
text: A number of companies, such as Bidflyer, Plusgrade and SeatFrog, have come up with applications that allow airlines to sell upgrades to the highest bidder through an auction mechanism -- an efficient but anonymous way to get passengers to tell the airline how much they're willing to pay for premium services.