I've flown USAir for business, all over the country, and haven't seen anything better or worse than any other airline. Nothing particularly special and nothing particularly bad.
The two great things in the ressie you've got now is......
1. Flying out of Allentown.
2. Flying into Tampa
I love Lehigh Valley Airport (ABE). It's small, never crowded, the planes tend to get in and out on time. Really makes for a much peaceful trip. If you have a non-stop to Tampa, even better.
Tampa's airport is like ABE, but a little bigger. We flew into Tampa last big WDW vacation in 2005. What a snap. No over child crowded flight. In and out of the airport in no time. We rented a minivan to get to WL. Trip from airport to WL was 90 minutes. Only ~1/2 hour longer than flying into Orlando. Dropped the car off at DTD. No fuss, no muss. We'd do it again for our April trip except the timing of our flights, and my use of Frequent Flyer miles forces us to go out of Philadelphia (Phila-hell-phia) Int'l.
If you wait for a Ding, you takes your chances. Could be great, but you could also be left waiting.
Enjoy your trip.