Wasn't it explained he was still fairly new to his powers at the time?
Yeah, months later, but he was never meant to be able to fly in the first place.
The decision to make him be able to fly was because it was requested by the maker of the Animated Superman Films of the 1940s, The Fleischer cartoons.
After seeing the "leaping' power fully animated, The Fleischer cartoons deemed it "silly looking" and asked Action Comics' (which would later become DC Comics) permission to have him fly instead.
Action Comics agreed and wrote the flight ability into the comics from then on.
While at the same time, the writers were not shy to make up whatever super-power on the spot needed for the story. Such as super-weaving.
True, even the movie version do this.
That "Turning Back Time" power to save Lois or superkiss power to erase Lois' memory, I'm sure that's not taken from the comic version.