Ouch! I haven't had this many consecutive upgrade-less flights since before I was a 1K with United four or five years ago.
Tuesday, Jan 31 - UA 252 SFO-DEN, A320
Thursday, Feb 2 - UA 1663 (CO Operated) DEN-IAH, 737-800
Thursday, Feb 2 - UA 1171 (CO Operated) IAH-DCA, 737-700
Friday, Feb 3 - UA 915 IAD-SFO, ...