Originally Posted by
MarkerInbound
They say that if you took off from a runway you can land on it and meet all performance requirements.
That's actually a certification requirement - it's called "Return to Land". Obviously for the scenario where you experience a major emergency during or right after takeoff.
Obviously you want the flight crew to be on their 'A' Game, and an overweight landing inspection will be required. But so long as you don't land long or 'plant' it on the runway it should be fine.
I was on a flight test 767 way back in the late 1980s - we'd been doing high gross weight stalls - and when were done we landed back at Boeing Field at about 375,000 pounds (IIRC, max landing weight was 320k) - no big deal (although we did fly back with the gear down to burn more fuel)...