While i'm trying to salvage data as the new hard drive exhibits signs of advanced dementia, why don't you folks take a look at the introductory tales for each of the ladies. All three of them debuted as features in the first issue of new titles.
Page Parks premiered in issue #1 of Blue Bolt, written by Ray Gill with art from William Rowland. (The standard practice of writer/artist ordering on the credits hadn't yet been established at this point) -
Okay, you're right. Page doesn't really qualify as a Fly Girl since she never takes the stick. But she was up there in the air very early on, and debuted in a highly prestigious title with a Joe Simon cover and young Jack Kirby just getting together with him in the background, about to start a partnership that would help shape the next half century of comics, and beyond. So she gets a mention anyway.
Meanwhile...
Actually, one month prior... Crack Comics #1 featured the debut of Lee Preston with Bob Powell using the Terrence MacAully pseudonym -
Three or four months later, depending on which comic you're counting from, Wings #1 hit the stands with Jane Martin. (Fred Hawks is a house name, not the actual creator)
Of the three, one had another handfull (and a half) of adventures, the second appeared perhaps a hundred times or more, and the third was never seen again. Care to guess who was whom?
This afternoon, we'll have the answers and an odd entry from later in the decade - a long running character who quit being a Fly Girl at the start of her first adventure.
See you in 12 hours!
page art from Blue Bolt #1, Crack Comics #1, and Wings Comics #1 (1940)