I like the convenience of flying out of PHL - I only live a half hour from the airport. Getting to JFK is a real marathon.

I did fly out of EWR to LHR, last year. We decided to take Amtrak to the Newark airport station. It looked easy - on paper. The train was an hour late, and we missed our flight ! However, United found us 2 seats on the next ( and last ) flight to LHR, so things worked out well.

I have always found United customer care more responsive than USAir. I still do not understand why American never notified me of the flight change.