Since I do not personally know Parker's and Kirby's professional and social preferences or their ambitions, I cannot comment on whether they would not find it dfficult to move to and live in Chicago.Jeez...
Parker and Kirby will not find it difficult at all to move to Chicago to run the 2nd largest airline. That is their ambition and their goal. They (or any one else I would think) will happily relocate to any city in the world for this opportunity. Believe me they find this VERY appealing and the people of Chicago consider their location appealing.
Also, Chicago is a great, vibrant city and attractive to young professionals.
I would seriously bank on HQ in Chicago. It is United's historical home with all of the necessary facilites, labor resources and knowledge bank to try to get this merger to be different. ...
The expressed purpose of the merger is "Consolidation" and it's intended result of long term profitability. It would be an exercise in futlilty if the planned outcome was to retain (as you appear to suggest) the huge existing (expensive), real estate base of United and not consider the far more conservative facilities of US - otherwise, why merge? If the HQ remains in Chicago, based on the proven MO of Parker/Kirby, it will not be at anywhere near it's current levels. I am very well aware of the absolute size and financial details of UA and speculate that the combined carrier will eventually need to shed 15-25% of their pre-merger expenses to sustain profitability in the current environment. It would appear to be naive to assume most of this reduction will be from US resources with Parker/Kirby at the helm. Having lived in Chicago for 3 years, I agree it it a vibrant city and IMO an interesting place to live - Apr through June and Sep through Nov.