My wife and I are planning to go to Santorini (JTR) late June, flying out of FRA. The options via ATH are very grim (both in terms of cost, as well as timing). There seems to be an option to fly via VIE on NIKI. They don't fly to JTR daily, but the dates work out.
Any thoughts on NIKI? Anything to watch out for? I read their luggage and carry-on rules, are they a pain in enforcing them wrt to weight, etc.? Also, does anyone know whether we can check through our luggage if the first leg (FRA -> VIE) is in the evening and the second leg (VIE -> JTR) is the next morning? Or will we have to pick them up in Vienna and recheck them the next morning.