This is regarding Priceline's standard booking engine, NOT the opaque bidding service they're known for. I've always had problems pulling up the exact itineraries I want on Priceline, but I figured it was due to unusual routings. However, today I tried to book a straightforward trip in F, and priceline pulls up no flights on United.

Anyone know if there's a workaround for this? Why is Priceline's search engine so sucky?