Which is ironic since planes, like swords or giant buildings, are usually considered phallic objects, so in a way, you are flying inside planes shapped like penises pretty much all the time.
You guys are taking this quote way too litterally. What should tip you off is when he describes the last phallic symbols on Paradise Island as being the Greek towers. If you've seen Greek Towers before, you would notice that, while they can be seen as "phallic" in in the sense that they're these big vertically erected buildings, they don't literally look like giant d.cks. They are reminiscent of a phallus, but they're not intentionnaly shaped like one.
Same for the plane. It's not going to look like a vagina. It's just that, unlike our pariarchal society whose architecture is all about erected buildings, the Amazons are going for more rounded design and the plane is going to be like that.