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Old Jul 13, 2018, 7:57 pm
  #320  
diburning
 
Join Date: Jun 2012
Location: New England
Programs: American Gold, Marriott Gold, Hilton Silver
Posts: 5,640
According to the IATA/ICAO:

777-300 = 773/B773
777-300ER = 77W/B77W

I've seen the 77W designation used on FT quite a bit.
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