in flight

Once you’re in the air, there aren't many differences between flying with and without skis. The main difference is found on canopies with speed stirrups. Locked-heel ski bindings prevent you from operating the stirrup. If you need to increase your descent rate or speed you'll have to pull "big ears" or adjust your trim tabs. With free-heel bindings you should be able to operate the stirrup.
When flying over large snowfields or glaciers, be aware that the cold snow surface may produce downslope winds, even during mid-day. The danger of wind shear makes glacier skimming a bad idea. Downslope breezes may also make launching impossible at times.