First off your numbers are a s Bogus as a Doug Parker interview. The number was more like 25 million annually and Joe Beery was challenged to create a "cost saving synergy" of 100 million annually.
No one has come forward with the numbers for all of the extra develpment costs that continue to this very day as US attempts to raise their IT to third world airline standards.
You'll notice they dumped Joe Beery. Now my guess is that it wasn't due to his superior performance of meeting budget projections.
Then we have that other scary talent Scott Kirby telling outright lies to the flying public regarding the Reservations Migration. When it comes to the credibility of Scott Kirby he has none and the phrase "False in one, False in all". It's a sorry commentary on the trust and credibility of US Management that many who read their public pronouncements as self serving spin at best or outright lies at worst and work backwards from there.
Even assuming your figure I can't help but wonder how many vouchers and other compensation were given out due to the res migration debacle. I wouldn't be surprised and if that's the case then how much money was actually saved???? How many customers left taking their $$$$ with them as a result of all that money saving?
During the Res Migration I was convinced that US Airways could NOT organize a one car funeral. Things have improved and I now believe that US is fully capable of at least a 4 car funeral.