Originally Posted by
topman
year round ?
All the major UA hubs are susceptible to weather events all year round - a little less so with perhaps DEN even then, a major snow/lightening event can cause problems.
When the weather is good - the rankings rise. When the weather is bad, they fall. When there is no airport construction - they rise. Airport construction - they fall.
You can't fight air traffic control. In me experience, UA pushes hard to get flights out on time - there are multiple posts of people mad when planes not held for them on the push for on-time departures.