No aircraft vehicle's are wearing any clothing but are sentient beings therefore whenever we look at them, they are nude which is highly inappropriate for children to watch.

None.

A plane crashes in episode 10.

"Heck" is mostly said.

As the characters are airplanes, it's naturally assumed they consume Jet Fuel. This may confuse children as they may also attempt to drink any form of fuel under the belief that it may transform them into an airplane which is obviously dangerous.

The animators were probably high.

Some mild peril happens in most episodes, but the characters are okay in the end.

The character designs are horrifying to a lot of people.

Moderate/Severe for neurodivergent viewers.