Originally Posted by
Nelumbo
It's good that you checked where the aircraft came from. You might also want to search for the weather when the aircraft departed from the previous airport. Sometimes UA's system just label their operation delays with "weather" for some reasons. To be honest, I don't like it.
I had once a longer-than-4-hr delay into midnight for a flight from ORD. According to flight status on .bomb, it was due to weather. I went to the RCC before it was closed, used the free wifi and found the aircraft was from LGA and the weather was excellent according to weather.com. I saved the webpages. Finally I wrote to UA and got compensation.
What you see as "good weather" on weather.com may not be good weather for an airport. For example, LaGuardia has two intersecting runways, and at peak times, both are needed and used to full capacity. But if the wind is strong (I don't recall the exact speed, but about 25 knots cross wind on one), it goes to one runway operation. This cuts down capacity by 50%! It's certainly causes weather delays but you would see "sunny" on weather.com and perhaps not even a shower within hundreds of miles.