Just wanted to add that while GVA has only one terminal, domestic French flights depart from "French Sector" that has separate check-in and departure areas. Being GVA based I have never transfered this way and I cannot find any description for such procedure at GVA website. I believe you have to follow signs " France" on arrival and prior to leaving main arrival hall. If you miss it and find yourself in landside arrival area, you would need to go up to the check-in level and go again through "Swiss-French" border (through sliding doors) and then clear security with other pax departing from French sector check-in area