Terrorists are in the midst of practice runs in preparations for an attack on U.S. airlines.

That is the claim made in a report from Tampa's CBS affiliate, WTSP TV.

WTSP has obtained what it claims is a memo from the union that represents pilots for many major airlines that warns that terrorist dry runs are already underway and that the most notable example is a flight inbound to Orlando in last month.

The pilots say the most recent dry-run occurred on Flight 1880 on September 2. The flight left Reagan National Airport in Washington D.C. and headed to Orlando International.

Crew members say that shortly after takeoff, a group of four "Middle Eastern" men caused a commotion.

The witnesses claim one of the men ran from his seat in coach, toward the flight deck door. He made a hard left and entered the forward bathroom "for a considerable length of time."

While he was in there, the other three men proceeded to move about the cabin, changing seats, opening overhead bins, and "generally making a scene." They appeared to be trying to occupy and distract the flight attendants.

The 10 News Investigators contacted both US Airways and the Transportation Security Administration both confirmed the incident. 

WTSP also spoke with a federal air marshall who has information about the incident and others like it. You can read the rest of that story here.