Well, I contend no. To better understand the ending to the Frontier films, recall the themes of the original show and how it ended. The TV show's narrative spends a lot of energy discussing how Alto feels trapped on the Frontier fleet. He longs to fly in open skies not held back by an artificial dome. It's several metaphors layered on top for how his life is going. At first he thinks he's found his freedom to fly by joining the SMS and being able to fly in a proper jet out in space, but the themes of the narrative imply that it isn't quite what he's looking for. He gives up a lot of personal freedom to join SMS, and he becomes bound by duty to do all kinds of things that goes against his nature like fighting and killing. It isn't until the very end of the show, when they've achieved peace and the Frontier fleet inherits the Vajra homeworld that he finally finds a real sky to fly in. In a very loaded scene where he jetisons his broken VF-25 and flies unimpeded, Sheryl and Ranka look on as he flies up and away. A scene very reminiscent to the ending of the Macross Plus OVAs*. But instead of the exact same ending where Isamu flying up and out of sight while Myung looks on, post-credits Alto flies back towards the heroines who are standing in verdant fields with his arms open for an embrace. Just like Isamu learns in Plus, freedom and flying are given context and meaning by having people and places to return to, and you can't just fly alone forever and be happy. (Missing in the film version, is the related epiphany that Alto has while fighting the Galaxy Cabal that loneliness is the context in which love springs.) This sky isn't the first natural sky he's flown in, but it's the first one that feels like home and fulfills the desires he's held all his life because it's the place that Sheryl and Ranka led him to.