I have a DONE4, booked directly with JL. I initially booked it with open-dated segments for flights that were not yet bookable. When I called JL last month to confirm those flights, they charged me $47.99 per passenger in "additional taxes". At the time of booking, each open segment was for a specific airline between two airports, which is supposed to allow accurate tax and airline overcharge calculation.

I called to move the last two flights (both on QR) to be one day earlier, and they quoted me $300 ad/col per passenger. That didn't seem right, so I declined and will try again. Is there any way that $300 can be correct? Massive new airline overcharges because of soaring fuel prices?