I'm staggered this thread is still going.
Could someone please list the commercial airliner types with more than 19 seats that could happily utilise this 1199m runway with no significant constraints on passenger or fuel load? Whilst you are at it, list the 19-seaters too - J31 for instance can't use this length.
Of those you think can happily perform commercial routes from such a 1199m runway, how many of those types are readily available, well supported with spares availability, MROs, easy to find/train type-rated crew, have relatively low operating costs per seat etc. etc.?
There's no scope to practically extend this runway at all - you're stuck with what there is with the requisite RESAs at either end and the clear and graded widths either side of the runway.
Complete and utter non-starter for commercial ops. It's also no good for any practical form of business aviation bar a few turboprops.
Sorry.