My Knowledge of US AIR is very limited but is it a union run airline?
As said above, US is not "union-run".
US does have a very high percentage of its labor groups unionized, however. The pilots are represented by ALPA. The flight attendants are represented by AFA. The mechanics, fleet service workers, and maintenance trainers are all represented by the IAM. The dispatchers, flight crew instructors, and simulator engineers are all represented by the TWU. The customers service agents / reservations agents are represented by the CWA.
In addition, union representatives hold 4 of the 15 seats on the US Airways Board of Directors. ALPA, IAM, and CWA each nominate one director; AFA and TWU together nominate one director.
If it is a union run airline do they have problems when acquiring new aircraft.
I'm not sure what you mean by this. US did
have perhaps the most restrictive RJ
scope clause in the industry, but not any longer.
I'm the expert on here on two things, neither of which I care about much anymore.