Mick M.
Hi Mick,
I have always been somewhat troubled by calling the Tenerife accident a Runway Incursion. Unlike the Indian incident, ATC was aware that both aircraft were on the same RWY. The PanAm 747 was backtracking with a clearance to do so, and the KLM 747 lined up, with ATC approval, at the RWY threshold awaiting a take-off clearance. IIRC the PIC of the KLM 747 commenced take-off without a take-off clearance. There were of course other factors involved not the least being some communication problems, low visibility and ATC's lack of familiarity with what taxiways the PanAm 747 could use.
There was nothing unauthorised (except the KLM PIC taking off) about the aircraft being where they were. It is not uncommon to have two aircraft on a RWY at the same time.
Regards
Stephen
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