I'm a bit confused on tnoight's UA1455 MDW-DEN. United's website says that a scheduled departure of 1722 became an actual departure of 1754. The schedule arrival time of 1849 is now 2134...2 hours, 45 minutes late. If I bounce to Flightaware, it says the "Actual" departure was 2011 and also parallels United's "estimate" of 2134 with a figure of 2116. I can take "estimates" that vary by 18 minutes. That's logical in my mind. How do we explain United's 1754 departure with Flightaware's 2011 departure. Why such disparity? No sarcasm please; I'm looking for an education here... Blaine Thompson