Proteus Airlines

In October 1999 Proteus acquired another regional airline, Flandre Air.

[2] On 30 July 1998, a Beechcraft 1900D, operating as Proteus Airlines Flight 706 from Lyon to Lorient in Brittany, was hit by a privately-owned Cessna 177RG over Quiberon Bay, killing all 15 people on board both aircraft.

The biggest contributing factor to the accident was the crew of the 1900D electing to take a detour to fly around the SS Norway.

While finishing the sightseeing pass over the ship and shifting their attention to landing preparations, the crew did not use the see and avoid concept that was part of the visual flight rules they were operating under.

In addition, the pilot of the Cessna had neglected to turn on his plane's transponder, effectively making the aircraft invisible to radar systems on the ground.