She says in the original article:
"I might be overreacting, but I've been watching some really suspicious things..." Before he could finish his statement, the flight attendant pulled him into the galley. In a quiet voice she explained that they were all concerned about what was going on. The captain was aware. The flight attendants were passing notes to each other. She said that there were people on board "higher up than you and me watching the men." My husband returned to his seat and relayed this information to me. He was feeling slightly better. I was feeling much worse. We were now two hours into a four-and-a-half hour flight. And this article here says: “We have to take all calls seriously, but the passenger was worried, not the flight crew or the federal air marshals,” she said. “The complaint did not stem from the flight crew.”
Well which is it? In her story the fight crew was concerned. Someone had to be concerned or else there wouldn't be a bunch feds and police to meet these guys at the gate when the plane arrived. The author of the original piece couldn't have called the authorities from the plane, so how did they show up at the gate and interrogate the group of "musicians?"