Federal agents stormed the cockpit of a Delta Air Lines flight moments after it landed in San Francisco on Saturday night, arresting the co-pilot in front of stunned passengers, officials confirmed.

Delta Flight 2809 had just arrived from Minneapolis when, according to passengers, a group of federal agents suddenly boarded the plane and stormed the cockpit.

In one of the most unexpected incidents, a Delta Airlines Pilot was arrested by Homeland security. The arrest happened at one ...