There is no bidding for airfare anymore on Priceline. There's no bidding for rental cars. Only hotels (and barely that--they make the Name Your Own Price link hard to find).
Priceline evolved from a creative new model to a very standard travel booking site. Hard to fathom why the stock should be worth more than $2,000 a share.
Anyhow, your airfare is probably just a standard bucket code, just as if you'd bought the same thing on the airline website. Only different with packages.