If I remember correctly it was armed with 20mm cannons while supersonic jets didn't have cannons and only relied on missiles which at that time still had some bugs to fix out.

Ah yes, the good old 'Flying Dumptruck', so called because of the ungodly amount of ordnance it could carry. (Seriously, I think the Skyraider broke a couple of laws of physics when it was fully loaded.)

The Huey pilots loved it too, not just because it helped save a lot of downed pilots, but because it could travel at the same speed as the choppers, giving them a whole lot of readily available firepower right when they needed it. There was no need to call for a bombing run and then wait for the bombers to show up, because the Skyraider was right there and could see the same targets as the choppers and could hit them before they had a chance to scatter.