"The senator made an off-the-cuff comment under his breath that he shouldn’t have made"

According to the GOP aide, a flight attendant then approached Schumer and told him the entire plane was waiting on him to shut down his phone.

Schumer asked if he could finish his conversation. When the flight attendant said “no,” Schumer ended his call but continued to argue his case.

He said he was entitled to keep his phone on until the cabin door was closed. The flight attendant said he was obliged to turn it off whenever a flight attendant asked.

“He argued with her about the rule,” the source said. “She said she doesn’t make the rules, she just follows them.”

When the flight attendant walked away, the witness says Schumer turned to Gillibrand and uttered the B-word.