Departure Time reporting inconsistant Southwest vs Airtran


#1

Why are Airtran departure times being reported a good 10-15 minutes BEFORE they are in the air at 900 feet?


#2

It takes them a long time to climb?


#3

Example?


#4

IT is being shown as departing ATL at 10:15 PM EST but there are no flight data points (coordinates and altitude) until 10:43 PM EST. This time is was 28 minutes.