Per View from the Wing, Delta Air Lines is accused of trapping their flight attendants onboard one of their flights back in May from Atlanta to Toronto.
The incident occurred after a maintenance delay, and rather than open the boarding the door, the gate agent was instructed to keep in closed and keep the crew onboard. If the door was opened, then the flight attendants would have the option of walking off which would of resulted in delaying the flight overnight, as Delta would rather do this than cancel a flight.
Per the Huffington Post,
A recent Delta flight leaving Atlanta ran into a maintenance problem, causing a lengthy delay before takeoff. As the airline tried to resolve the issue, someone feared the holdup might cause an even bigger headache: flight attendants walking off the plane because they had worked so long.
So, according to internal communications reviewed by HuffPost, an employee in Delta’s operations control center sent a directive to the Delta gate agent handling the flight.
“Do not open door,” the message read. “flt attendants out of time and none available.” The employee advised the gate agent to “let [maintenance] do their work without opening door thanks.”