the idea of super powered beings being able to fly is far older than Marvel and Superman and is one of the most basic and generic powers, Marvel law-suit or not, flight becoming one of Superman's powers is natural progression.
Nah. Denial is not cool. I guess Lex Luthor going bald was natural progression too? Admit it. CM was more popular(fact: His books sold more than Supes) so they ran to the courts like bit<hes & took his flight(fact: Supes used to just "leap tall buildings in a single bound") & made Lex more like CMs bald headed bad guy(fact: Lex had a full head of red hair). This is not opinion & it's not rocket science.
Lex going bald I'll admit was a ghey move on their part(and stupid too, I mean wtf), as far as flight goes, I'm reaching back really far, even Captain Marvel's flight in his actual story is a trait of Hermes/Mercury, flight is an incredibly old power and idea.
Damn near all powers are when you think about it(except wall crawling ). I'm just talking about in comics tho. So I guess your answer is none. The natural progression of jumping high is simply jumping higher CM @least has an explanation 4 it tho. He's based on mythology & religion. It's in the word S.H.A.Z.A.M. Supes explanation is "CM did it & the kids liked it so now I'm doing it too."
Well comics also did not exist much longer than Superman, at least not the superhero comics we are discussing.
And I just did some quick research. The law suit you are speaking of happened in 1951. Lex first appeared as a cue ball in 1941. And DC did not even aquire the rights to Marvel until 1970. Superman was able to fly in 1941, long before the law-suit, and only 2 years after Marvel was even created.
They ripped him off & when that still didn't work, THEN they sued. When they ripped off the flight & baldness, CM was ALREADY outselling Supes with ease. CM got more popular than Supes almost instantly.
TBH they're both good characters and they are the best DC has to offer moral/view of a hero wise. Yeah Superman is more popular than Marvel but Marvel is still great and has the edge over Superman in a few things and vice versa.
And Superman is faster than a speeding bullet. So you know he gets like 5 seconds of pleasure before he explodes all over her face. Theoretically Marvel could go as long as he wanted with his child penis. All he has to do is yell SHAZAM and a bolt comes down and refreshes him.