http://theaviationist.com/2014/03/20/mh370-total-recap/
The link above contains the only map I’ve seen that shows the results of the pings at 5:11, 6:11, and 7:11, as well as the originally reported 8:11 one.
If one looks at the Pakistan area on the map, the plane would have had to been flying away from Pakistan from 7:11 to 8:11, making it unlikely for it to have made it back to Pakistan in time to land the plane.
However, if, as I’ve speculated elsewhere, the pilot intended to circle back toward Malaysia and drop the plane on a government building in a fit of political rage, that route would easily fit within the parameters of the four pings.
He could have continued west for a bit, and then circled back south and then east, toward Malaysia from the south, and easily have been located on all four ping lines throughout that route. I suspect he either ran short of fuel, or more likely, came to his senses after killing all the passengers, and ditched the plane deep in the ocean where we might never find it.
Note that the map also includes ocean depths, almost 2 miles deep south of Singapore where I suspect he ditched the plane. On the other hand, if he ran out of fuel short of his intended target, have they searched the Java Sea south of Malaysia yet?
Notice they all end in 11. Therefore: Pakistan.