The pull up and pull out would be fun though. Minimum loop entry is ummm 3 - 3.5 g ish?
That would depend on the thrust/weight ratio... If high enough, you could do it at 1.5 or 2 Gs.
I suspect that a light 744 would loop with little problem at 3.5 Gs. Since it's certified at 2.5 Gs at max weight of 369 Tonnes, it should be able to withstand 3.5 Gs once at 180 Tonnes, and with 113 Tonnes of thrust, it should go over the top handily...