Yeah, I checked one near me and it said EMS arrived 1 minute after being notified and victim was transported via EMS air. Time to arrive at hospital seems reasonable for an air transport from that spot though. So I guess the helicopter just happened to be idly hovering over the van at the time it went off the embankment?
Ground EMS could have arrived in 1 minute if they were already nearby. Just because the patient was transported by air doesn't necessarily mean that the helicopter unit was first to arrive.
Even if the helicopter is overhead for a planned drill you can't land it in a minute. 30 years ago if my first cpr class the teacher said it was typically 45 minutes from when you call - which is why they (in a big city where a level 1 trauma hospitial is at most a 30 minute drive away) almost never call for air help.