NEWS FLASH
Air France will increase its frequencies between Paris and Belgrade later this month after recently restoring the service. The carrier will continue to maintain three weekly flights between the two capital cities until July 18, increasing to five weekly rotations from July 19, each Monday, Wednesday, Thursday, Friday. and Sunday. Air France resumed operations to Belgrade on June 23. All flights will be maintained by the Airbus A319 aircraft. It comes as the French carrier continues to grow and restore its network, recently announcing the launch of brand new routes to Muscat, Colombo and Zanzibar.

Comments
Another market to follow is Zurich where Swiss is upping its game and wants a larger piece of this massive and highly lucrative market.
Great addition to BEG, a 3x daily to CDG between JU and AF is meeting the needs for business travel (early morning and evening flights) and leisure, as well as connections to AF international network.
Last year they operated Nice, I don't know if AF placed its code on that flight and if they plan to restart next year they should really look into it.
Same goes on for Lyon, JU could look at that potential maybe 2x weekly (yes I know Wizz tried and stopped), connections beyond to Montenegro and other places beyond BG, as well as AF's code could be sufficient to make this work!
Dont know why AFs four or five weekly flights could be a threat to Air Serbia which flies to Paris double daily.
Also Easyjet flew to Geneva before AS did so if anyone is a threat then it is the latter.