As for the USAir guys hoping that a portion of their operation will be the nucleus of Virgin USA..............dream on fellas.
Branson has only once taken over an existing operation (in Belgium), and has regretted it ever since. He likes fresh people with fresh ideas, not the we-used-to-do-it-this-way-at-XYZ types, and the sort of salaries he will be offering will be well short of what USAir pay. There certainly won't be any scope clauses, no guarantee of a seniority system and many other 1950's-type ideas (even though we all love them) will be absent from the contract.
Having said that, it will be a fun place to work, with everyone upbeat about growth (inevitable) and committed to providing jaded US travellers with a new type of travel experience. The average age of staff, particularly cabin crew, will be about half that of the incumbent carriers, and even the uniforms will be a departure from the norm.
If you get a chance, join the team.