N31957 Grumman US-2A Tracker Private Houston - Ellington Field (EFD / KEFD), USA - Texas Javier Vera - 22/10/2017
N31957 Grumman US-2A Tracker Private Houston - Ellington Field (EFD / KEFD), USA - Texas Erik Frikke - 20/10/2017
N31957 Grumman TS-2A Tracker Collings Foundation Houston - Ellington Field (EFD / KEFD), USA - Texas Martin Harrison - 10/03/2013
