1/ the 737 did not "back into the A320"
2/ "wing passing under the horizontal tailplane". What? I hope not
You can see from the photo the idiot driving the tug screwed up and pushed the 737 too far off the centre....the main gear are around 40' off the line....
Thousands of push backs all around the world everyday, someone somewhere is bound to cockup.
Virgin 737 was pushed into a Jetstar A320 in YMML a while ago too.