Five U.S. Airways crew members became sick on a flight from Washington to Boston on Monday, after they had earlier complained of a bothersome odor on another plane.

Crew members and passengers on Flight 2022 had reported some odor after a plane left Ronald Reagan-Washington National Airport, so the flight returned to the airport. They crew and passengers then swapped planes for the flight to Boston.

However, five crew members still became ill with unspecified symptoms, according to Valerie Wunder, a spokeswoman for U.S. Airways, based in Phoenix.

No passengers were affected, she said.

The crew members were taken to a local hospital for treatment.