Why don't you tell us what you see happening - is it flights cancelled out of one city? Reservations system not working?
Looks like 12 United domestic flights cancelled today. Delays at LaGuardia and Dulles for all airlines.
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them