Originally Posted by ajthegreat

I have a head scratcher. I noticed that a 788 was flying as UA3781 on SFO-LAX-BWI last night and is currently in the air as UA3774 on BWI-SFO. The usual LAX-BWI redeye on a 737-9MAX ran as usual as is the usual morning BWI-SFO flight. The seat map for both 788 flights showed completely empty. Any thoughts on what these flights could have been for?