FUJI KM-2Kai (12-9004)

Sharp looking jets. Are they part of a larger flight demo team?

Headline is off. Clearly an AIDC T-5 as indicated in the light and small grey text. The KM-2 is a previous generation prop trainer.

Someone has their tail numbers mixed up. Must have done a biden. One is 10-9004 and the other is 12-9019. I don't see 12-9004 unless it is in "stealth" mode.

Thought the postal service had a team for a second.

Nice photo, but totally mislabelled as othershave pointed out!
The Fuji T-5 or KM-2Kai is a Japanese turboprop-driven primary trainer aircraft, which is a development of the earlier Fuji KM-2. The student and the instructor sit side-by-side.

Aircraft: AIDC T-BE5A Brave Eagle
Taiwan Air Force

https://en.wikipedia.org/wiki/AIDC_T-5_Brave_Eagle

I'll assume, not to be confused with the TA50 Golden Eagle, yes?

I didn't know the USPS had and aerial demonstration team.