I would like to re-adjust my list as I was a bit rushed this morning:
All the 'obvious' markets are now filled at Manchester, so, long haul wise, its going to take some more 'out of the box' thinking.
Middle east:
MAN has all 3 MEB3 carriers, plus Saudia. To add to my earlier list, Kuwait Airways have sniffed around MAN on more than one occasion, and have run a few one-off charters. They have re-applied for slots again next year.
Also, Saudi to Riyadh is very possible.
USA/Canada:
Westjet has publicly said that MAN is on their radar for St. John's. Outside of that, Virgin or Thomas Cook to LAX as stated in the last post, or AA to Dallas (there could also be more flights to existing destinations, however, I'm looking at new routes only).
Africa:
Kenyan have applied for MAN-AMS-NBO in the past, so, could look again. Cape town is prime B787 territory, as the B747's of South African Airlines and B767s of Globespan and Avi8 did not work in the past. Other than that, Ethiopian is expanding well, and Arik Air are only allowed to serve MAN and LHR should they want to expand.
Far East:
JAL to Haneda, AAX to Kuala Lumpur, Hainan to Beijing and, believe it or not, Cebu Pacific has said Manchester-Manila is on their hit list (god knows why).