After spending over six hours at Louisville Airport, waiting to catch a flight to Newark, I get this tweet:
Weather on the East Coast & in Chicago may impact flts. Options to change: bit.ly/Yb0zTC
— United (@united) March 18, 2013
Granted my cancellation was due to a mechanical issue, not weather, but it would have been nice to have known about this waiver before waking up at 4:00 AM.