In short, whether there are long-term savings to be made by using super hydrophobic surfaces (SHS) on ships is still an open question.
There have been many claims, but the benefits have yet to be shown on real ships. There are many factors that come into play, such as durability of the surface, its cost, whether the surface must be cleaned in special ways etc. These will require testing over long periods of time.
There is some discussion of the potential of SHS in the paper:
"Science and Technology Challenges and Potential Game-Changing Opportunities ",
Special Report 306: Naval engineering in the 21st century the science and technology foundation for future naval fleets,
A recent book also discusses SHS. See:
Perlin, Marc and Ceccio, Steven,
"Mitigation of Hydrodynamic Resistance: Methods to Reduce Hydrodynamic Drag",
2015, 150 pp.
Be aware that there are quite a few people making unsubstantiated claims for drag reduction.
My advice is to treat any claims of large performance gains with suspicion, and to keep an eye on developments
reported by the International Towing Tank Conference (ITTC).
(I'm sorry, but I can't help with your question about how SHS can be used to effect on aircraft.)