What was the safety record of US and AWA pre merger?
How many fatalities do east vs west have?
How many east pilots have SHOT their own aircraft vs west?
How many runway run offs post merger of east and west? Don't forget the east crew that while "racing" to beat a west aircraft to the only US gate taxied right into the mud.
No FOQA data needed, just check on the DOT's accident database.
I don't allow my family to fly on east metal, it's a no brainer.