Now, I

The PMDG simulation recreates reality most closely in this case. Only a very small increase from idle thrust is required to get the 737 moving, then reduce to idle again and the speed will pretty much be maintained through momentum.In reality a light 737 with low fuel and passenger load will move without any thrust at all, just release the brakes and forward ye shall go...Idle thrust on a big jet is actually quite a lot of thrust, and most big planes are like this.. A320.. 757, etc..Andy

EGCC is correct. Modern high-bypass turbofan engines have a lot of "residual thrust", ie they produce a lot of thrust even at idle. You only need a very small throttle increase if any to get moving and the aircraft will happily taxi along at idle after that. This is one of the reasons that when under 10000ft in a modern jet its very difficult to descend and slow down at the same time, you are always getting a bit of a shove from the engines.