LINTHICUM, Md. (WJZ) — BWI firefighter crews were investigating a Southwest Airlines flight after a Southwest crewmember observed two packets on the aircraft floor that appeared to contain powdery substances, Southwest said Monday.

Out of caution, Southwest switched Flight 466, flying from BWI Airport to Oklahoma City’s Will Rogers World Airport to a different aircraft.

The Southwest team requested the support of BWI Fire and Rescue Department and a hazardous materials team which determined the substances to be “non-hazardous,” they said.