let's talk airliner babies
(some light nsfw parts mentioned in the first paragraph)
All vehicles in my AU are hermaphrodite.
Only airliners have the "back pussy", since they're so ungodly big and low on their landing gear that below just wouldn't work. Now you may ask yourself, how do they mount? Well my dear friend, ever heard of ramps? Yes, they have docking ramps at every big airport/place where airliners can come so they can do it in private. The nose gear rests on/in front of the bottom's nose, and the back are on the ramp or the partner's wings. Of course this depends on the model, because I don't see a small Embraer's wings supporting a B747/A380.
They have a single womb, protected with thicker metal plating, and it's located in front of the weenis compartment. When the plane gets excited the weenis extends, think hydrolics, and the transfluid tank fills.
Pregnancy lasts 9 months, with the Mama being grounded in month 6. Sometimes earlier, depending on the amount of planelets the litter holds. In the last month the Mama becomes Gollum, and will chase anyone away from their nest bc the protective/parental instincts just kicked in.
Childbirth is easy and painless; the thick plates simply slide open when the bebe's ready. Young planelets are the size of a human toddler, and a litter can hold up to five at a time. Mama planes hold external openings for their secondary fuel tanks, so the planelets can be "breastfed" by them. Mama is a universal term for any plane who birthed a litter, no matter if they identify as f, m or nb.
Planelets "shed" their plating when they're 5 months old, one of the reasons many Mamas don't paint or prime them.
At around 2 years the first growth spurt is done, and airliner planelets should now be about the size of half their mama. So a B737 should be double the size of their baby. This is also the point where a mechanic can see if the kid grows well or may need some additional help. This hlp can be either more "nutritional" fuel, or simply building the kid bigger (very expensive).
At 4 the kid should be 3/4th the size of their parent, and then the final, most painful growth spurt starts. In 2 months the kid grows to their full size. This is the "ugly baby bird" phase, as their plating often can't keep up with regrowing (stretchmarks) and leaves the softer inner shell exposed. This is the most vulnerable time for the child, so they often spend those two months in a safe shelter with their mama.
Paint and primer are also strictly off-limits for planelets with visible secondary shell, as the chemicals in it can badly damage the shell and often lead to fatal injuries because the chemicals stop the regrowth of the softer shell.
