I'm not at home right now but I had worked on another one that the trident was more angular and outer tines looked like a v and the middle more like an A. Having a very graphic easy to reproduce and recognize symbol can be a great plus when branding your business. I really want to produce the perfect logo for you.
Can you clone the design #12 and replace the trident by a ferry and an airplane (a small ferry and a small airplane similar to the design #4 should be nice). Most of my friends suggested the same.
I was still going to make a design with an airplane and a ferry, just didn't have enough time to do so when I was home at lunchbreak. I'll work on that this evening. I will use a different perspective for the each. I was thinking the plane flying up and the boat down each making the A and V.