The bulk update request #11927 is pending approval.

create alias planes (0) -> airplane (5272)
create alias airplanes (0) -> airplane (5272)

Reason: Aliases away some plural forms of airplane.

Tag history:
https://e621.net/post_versions?commit=Search&search%5Btags_added%5D=planes
https://e621.net/post_versions?commit=Search&search%5Btags_added%5D=airplanes