from the priceline website:

"Tickets issued through priceline.com are not eligible for benefits such as, Frequent Flyer miles and segments, or upgrades."

i've never booked a flight thru priceline (too many horror stories), but i have used it to book cars. i was never able to get my hertz gold number into reservations. i have heard of people on here getting elite seats on priceline, but never mileage...