Superman--
Beginning of movie, astronaut has trouble, Superman comes out and saves him as he's drifting away from his shuttle/sattellite whatever.
Flash--
Just before the final fight with a speedster, Linda is thrown from the top of a building, the final act/battle starts and Flash battles furiously constantly, a process which takes about 20minutes. At the end of the fight, he runs back, asap to where it started and catches Linda just before she hits the ground.
Green Lantern--
(John ideally, but any GL can do something similar), the villain lets out carnage downtown, a building is tilting and falling over. John gets under it and grabs it with a beam of light, concentrating, he not only puts the building back, rebuilds it's connections, but fixes the building even better than it was before before flying off after the villain.