Today we finally rollout the long anticipated patch that brings all existing game worlds up to the same data level as the recently launched Quimby IV. Most importantly, this includes the new A320neo and several other new aircraft types.
But as mentioned before, the parameters of about 150 aircraft types have been adjusted as well. Most of these changes will only affect your existing fleets and their schedules when you plan new flights or update existing ones. Any flights scheduled right now will continue to operate with their current performance values.
If you want to know which airports have been adjusted as part of the data patch, you can refer to this PDF.
Once again, a big shoutout to the community members that have invested countless hours of their spare time to make this upgrade possible!