Originally Posted by
businesstraveller2
Yes they flew us to SYD as an extra flight in addition to the regular 10:15pm flight. We left ahead of them at 9:30pm. I did not know how ATC handled this I was very curious because we did have the same flight number.
When this happens, they'll usually add a letter to the end of the additional sector.
Example:
UA870 SFO-SYD
UA870(T) Tango SFO-SYD (extra sector)