There's no better place in winter for earning a Commercial certificate than Hawaii (Florida and North Dakota FBOs, feel free to disagree). Island cross-country navigation is easy: Fly to the land lumps and not mindlessly out to sea. FAR 61.129(i) says that on the Mainland (lower 48), Commercial candidates shall fly "One cross-country flight of not less than 300 nautical miles total distance, with landings at a minimum of three points, one of which is a straight-line distance of at least 250 nautical miles from the original departure point." In the Hawaiian archipelago, that longest segment need only have a straight-line distance of at least (_____) nautical miles.
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