our BMA midland baby dc-9's would depart from the runway 28R intersection opposite T1 A7 gate and could be at 3-4000' by the end of the runway
ATC loved us....fond memories
going to my car after Late's in the northside car park often would see in the late 70's/early 80's the late departures of SQ SAA and QF classic 747's all rather heavy and loaded using almost full length to the end -
these a/c were -200B PW variants so iirc could just do the longer hauls going East or South...not sure if SIN was non stop then or went via DXB and again not sure if BKK/SIN was non-stop then for QF deps
BA still had the early PW -100's and most of their departures going East or South were 'stoppers'
Their -236 RR Rollers came along soon though