DL has been flying over the Middle East for years enroute to India. Normal routes to India take you over Iran whether going from western Europe or the US. Remember that NW
made an emergecy landing in Teheran not too long ago.
's normal routes for flight 16 take it over western Europe and Iran and southern Pakistan going to India. Coming back, routes go north out of India over the "-stans", up over Russia, and over Scandanavia. DL
has been crossing the Atlantic above the Arctic circle.
Their enroute times have lengthened as winter winds have strengthened. The flight is now enroute for as long as 16 1/2 hrs - that's in the air, not block to block. The 777 and DL
are handling the longest flight (DL 17) by a US carrier based on time very well.