Considering that your only option is to island-hop via air carrier, I believe your next call should be to one of them. I hope you know that O`ahu, where honolulu is located, and Maui are two separate islands. Since you have 50 people a private charter could do. However, I'm not sure the private charters that are available can accommodate that many on one trip in a single plane. But you could certainly try.
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