I'd be very surprised if the runway was really 11000 ft. My memory of my last trip there about 10 years ago was a runway just under 6000 ft long. That is why both IC
/9W schedule their flights as early morning arrivals/departures - anything warmer and the aircraft would not be able to make the 2 hour flight back to the mainland.
Regarding military activity, there is a naval base there but the only aircraft based at IXZ used to be Sea Harriers with VTOL capacity - so the runway length is sufficient for them.
As mrniji says, it is an absolutely tiny airport. No taxiways, no apron, nothing. Just a single strip leading from a sheer cliff to a hill. Aircraft turn around at the end of the runway and passengers offload/onload right there. There are no conveyors or similar for luggage. The guys put it into a truck and park by the terminal. You then root through the pile and figure out which is yours.
The approach to IXZ is indeed very spectacular as you are literally flying over open ocean and coral reefs until you hit the runway which is almost 100 feet above the sea level and comes at you out of nowhere.
I too have pictures of the Andamans, but not of the airport itself. Due to the naval base, photography there is highly prohibited (more so than at most Indian airports) so I didn't risk any photos.
The Andamans are truly paradise on earth and I would love to go back there sometime.
"The A340-300 may boast a long range, but the A340 is underpowered" -- Robert Milton, CEO - Air Canada