Lightning Strike is Aerrow's late father.Bam. Might as well start with the obvious.
Atmosians have a much larger lung capacity than most earth-dwelling humans.Picking up oxygen in high altitudes and shouting to each other over loud engines made this trait much more favorable.
Atmos has lower gravity than Earth.Leave aside all the issues regarding unlikely levitation and whatnot, most of the Atmosian's body types seem to trend toward lithe and lanky, but with proportionally large upper torsos. These resemble some scientific conjectures about what a humanoid species on a lower gravity planet may look like. Plus, y'know, all those crazy aerial stunts they pull would be helped by lower gravity.
The Leapers are in fact members of Ridley's race, in their juvenile stage of developmentThis is mostly a joke, but they do look like a variant species of little Birdie. Possibly a group the emigrated to a different planet, and adapted different features.
Radarr is actually a child BlizzarianApart from tail length and the ability to talk, there is remarkable similarity between the Blizzarians and Radarr.
The conflict in which Lightning Strike was killed was over Terra Merbia.Seeing how Stork was rendered homeless around the same time the Condor went down in flames, and it seems the ship was near enough for him to walk to without being killed on the Wasteland, it's entirely possible that Lightning Strike was leading a defense force to stop Cyclonia from destroying Merbia. Cyclonia won and destroyed the Terra because of the Dark Ace's betrayal - he slaughtered Lightning Strike and the other Storm Hawks in time for the Cyclonians to win. The Interceptors may also have been present, allowing for Starling's backstory.
The cloning device from "Infinnity" is precursor technologyAs in, the people who built the Forbidden City and the temple from "Shipwrecked" and had some kind of connection with the Far Side. A mysterious, powerful, ancient artifact like this seems right up their alley. Also, Snipe led an expedition to the Forbidden City just two episodes before going to pick up the device on Saharr — there may be a connection there.
Storm Hawks takes place a long time after the events of Dragon FlyzBoth settings have a Lethal Lava Land Death World as a surface, with any human habitation at high altitude. The inhabitants of both settings use power crystals to run their technology. Long-distance travel is accomplished primarily by huge airships. Maybe Aaron finally found that paradise he was looking for.