An emergency has been declared on a flight from Nantes to Porto operated by EasyJet on Wednesday, tracker RadarBox said.
The EJU16TP flight is said to have been diverted to Bordeaux airport after squawking 7700 - pilot code for urgent situations.
RadarBox later tweeted that the flight has been diverted due to an "ill passenger". According to the tracker's website, the plane has landed at Bordeaux-Mérignac Airport.