I heard it was a variety of federal law enforcement, along with a local agency (Contra Costa Sheriff) carrying out the arrest. I recall there was another pilot being arrested at an airport, but I don't believe they went on the plane to get him.
https://www.startribune.com/delta-pilot-arrested-msp/601444849
This has a rather short video of the law enforcement getting off with a shocked captain.
https://viewfromthewing.com/stormed...pilot-moments-after-landing-in-san-francisco/
https://www.startribune.com/delta-pilot-arrested-msp/601444849
A spokesperson for Homeland Security Investigations in San Francisco told the Chronicle on Sunday night that the agency assisted local officials in executing an arrest warrant.
“This is an ongoing local investigation with the Contra Costa County Sheriff’s Office,” the spokesperson said.
This has a rather short video of the law enforcement getting off with a shocked captain.
https://viewfromthewing.com/stormed...pilot-moments-after-landing-in-san-francisco/