The callsigns of U-125A SAR aircraft used by the JASDF's Air Rescue Training Squadron at Komaki Air Base:

ASCOT -> BELL (May, 2015) -> ALICE (July, 2015) and last 2 digits of tail number.

See also Southern Cross Travel Club's webpage and Marusei Shokudou's photo blog.

I doubt that's Touhou Alice.

ddd666 said:

I doubt that's Touhou Alice.

Ddd666, you are right. Judging from the artist's works ([1] [2]) in November last year, she is an original airplane personification. Removed the touhou tags.