Originally Posted by pbartp

What date are you flying? First, check the seat map. If there are no E- seats available, go ahead and check in. If the flight is oversold, UA may ask you if you are willing to give up your seat. Usually, first-come first-served, so checking in early may be an advantage. If not, you will want to ask the gate agent once you arrive at the airport. I am almost positive you will not be offered an upgrade. There are probably several pax in coach who are using various instruments to upg, which will clear some seats in economy--but those should be good seats (E+).

Good luck.