If I am going to the airport to pick up Mrs and get there early I come off the M-way to the airport but then go past the airport towards Wythenshaw on Ringway Rd. After about a mile and a bit and on right OPPOSITE the Moss Nook House Pub
(on the left) is a small road, almost a track.
I park in there (taxis park there as well). When I get the "I am here" phone call it is just a quick exit left out of that small road and down to the airport to make a pick up outside the doors of the terminal. 5 mins max
DO NOT park by the Moss Nook ie on the right because you have to cross the traffic lanes and it can be a bugger to get from there back into the traffic flow towards the airport.
Done this lots of times