I noticed when doing a search for a late summer flight from ABE (Allentown) to IAD that United's nonstop flights weren't showing up. I sent an email to ABE's general email and got this response: "Hello, The flight to Washington/Dulles is only continuing until February 13. United has decided to use different connections to their destinations. We apologize for the inconvenience this is causing you." I have heard that ABE has increased their landing fees so that probably has something to do with it, but almost everytime I've flown that route it was full, interested that United decided to drop it, and not good for me.