Some more info on the height of AC759 as it initiated the go-around:
"
The Air Canada plane was estimated to have overflown the first two jets on the taxiway by as little as 100 feet, and the third by 200 feet and the fourth by 300 feet as it was climbing, according to CNN partner CTV, citing a preliminary report from the Transportation Safety Board of Canada. The A320 got within 29 feet laterally of the other aircraft."
http://www.cnn.com/2017/07/11/us/air...rnd/index.html