USAirways is fine....the service is not as good as it once was, but except for a few carriers, that is endemic in the industry.
Safety is not an issue, though. SWA may also offer a competing rate, but their schedules aren't posted that far in advance. 
Hey,
US Airways STINKS!
I brought a ticket for a business trip to Atlanta in July for $199-
My meeting date got changed, had to reschedule fight, the price of the new ticket was $400+ ; no problem I understand the rate went up but...then they charged me and additional $100- for changing the fight!!!
I could see them charging a fee IF the new rate was lower but higher????
Thats just crazy.
Not to mention that I had to speak with 6 people before the change was made (almost 45 minute on the phone) and oh yeah... they changed the original fight times on me by 4hrs so even if the meeting date didn't change I would have missed it. When I asked CS if I would still have to pay more because the airline changed the fight time and I would miss the meeting he said "oh yeah, not our problem!"
Crazy!
If I were you I'd stick with Jet Blue.
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That said most folks on the DIS will fly them if the price is right. (The DIS talks about wanting "service" but spends 99% of it's time looking for the $39 airfares....incompatible statments?)
...to whereever I need to go. I can honestly say I haven't had a problem. However, anytime I fly United through Dulles I prepare for problems & lonnnnnnnnng extended layovers. Moral of the story...any airline can have problems on any given day.OK. I don't really like USAir BUT if you change the flights then you have to pay the fees. Sorry! This is not unique to USAir.
For those of you consideirng them remember Consumer Reports is not commenting on safety just customer happiness. (USAir is being run by idiots so customers are low on their list, plus thier employees seem to hate management. Always a positive LOL!)
That said most folks on the DIS will fly them if the price is right. (The DIS talks about wanting "service" but spends 99% of it's time looking for the $39 airfares....incompatible statments?)

How is it to fly United/USairways
SW charges nothing (to the best of my knowledge), nobody has a better frequent flyer plan, and their on-time record is light-years ahead of everybody else's.
The point is that when you do book your flights on Southwest's website (as do 70% of their customers), you can use that free ticket to fly from coast to coast, with almost NO chance that you won't be able to get that free flight.
Since they've also made flying coast-to-coast a one-stop proposition on a single size aircraft as opposed to those smaller jets which the other carriers have been adding to their fleets for longer and longer flights, that's not too shabby either.
Complaints to the other airlines have soared because since those airlines have started using much smaller aircraft for more and more (and longer) flights, getting a free R/T ticket (once you've satisified their ever escalating mileage requirements) for a domestic flight is almost impossible unless you're willing to cough up extra $$$ to fly first class.
They've also reduced the periods for acitivity on those frequent flyer accounts as well, and alienating their customers some more which Southwest hasn't done either.
And those tiny jets that those carriers use are very noisy compared to a Southwest 737.
Another key item that most of the travelling public has no clue about is that when those six legacy carriers utilize those smaller jets which are not theirs but one of the airlines which they use for commuter/connecting flights (Comair/Delta, United/United Express, etc.) those flights have far worse records for on-time performance than the major carrier, yet those late flights do not result in those on-time performance records of the major carriers which you see monthly being downgraded, which merely widens the gap between their on-time records and Southwest's, which is very good to begin with.
nobody [SWA] has a better frequent flyer plan
the gap between their on-time records and Southwest's, which is very good to begin with.

If planning your vacation consisted of driving 75-150 miles will result in your easily saving hundreds of dollars (even with today's gasoline prices) as opposed to flying into the hub of the legacy carrier, wouldn't you avoid the monopolies which the hub-and-spoke airlines have, and the nosebleed-inducing skyhigh airfares that go with them?
Of course you would!!!