UA153 is now F6 NF4. The one pax who had a reservation but no seat disappeared this morning and the later the availability went to NF5. Just a little while ago one more F seat was assigned and the flight is back to NF4. I am curious to see what happens tonight at the 120 hour GS window (18:45 CST).
UA153 Feb 28 ORD SFO F seatmap snapshot as of this posting.
F6 P5 A5 Y9 B9 E9 M9 U9 H9 Q9 V9 W9 T9 S9 K9 L9 NF4 XF0 NC0 XC0 G9 NY9 XY9