dear original poster:
you said "THEY NEVER EVEN SENT THE PLANE". And you speak of the time of the flight between DFW and SEA.
Do you know where the plane was coming from? Do you know if there was a last minute substitution?
There are simply so many things that make an airline work and I'll wager you only think you know how an airline works.
AGAIN, report back when things have calmed down and you call again