It might be wise for individuals in this thread to wait to get an "official email" from united regarding you cancellation before you file your DOT complaint. You could claim that u only saw the 4 mile award, figured they were doing some special (this could especially apply if you do not have elite status and therefore did not know that specials like this do not regularly occur----frontier or spirit airlines have not uncommonly run a flash $1 fare sale not advertised....why couldn't that be true of united?) and that you never knew of the blogs....united would have a hard time proving you knew....right now, no one has officially been notified unless they happened to check their united website