James Corden was spotted confronting a British Airways employee over a turbulent flight from Portugal to the U.K. on Sunday, June 2, RadarOnline.com has learned. While the talk show host has been slammed in the past for his diva behavior, fellow passengers revealed Corden was actually a huge help in calming tensions over the turbulent flight — and stuck up for them during an emergency landing. While en route to London, the flight was forced to make an emergency stop in Lisbon due to a technical fault. According to the Daily Mail, the plane struggled to gain altitude after take off and circled …