On 9/11, did UA175 take off at 8:14 or 8:23? Did UA93 take off at 8:42 or 8:28?
UA175 took off at 8:23, according to the Bureau of Transportation Statistics. The BTS reports detailed departure statistics on all commercial flights in the USA. The reported Wheels-Off times are automatically transmitted by each aircraft when the wheels leave the runway.
UA175 took off at 8:14, according to the 9/11 Commission's Report. This time was based on FAA communication transcripts and various National Transportation and Safety Board studies.
UA93 took off at 8:28 according to BTS, at 8:42 according to the Commission.
No official investigation has publicly acknowledged the discrepancy, let alone explained or resolved the discrepancy.