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The International Date Line is the same for all nations.
That completely depends on where the flight is headed.
Alaska is.
Hawaii is close to the imaginary line called the Equator. It is also close to the International Date Line.
The Cook Islands of New Zealand are on the east side of the International Date Line, 10 hours behind UTC (the same time offset as Hawaii).
It is Alaska.
It is Alaska.
Both. The International Date Line is nominally the line of 180 degrees longitude, both east and west ... exactly opposite the Prime Meridian and half-the-earth away from it. The Line was drawn with some jogs and zig-zags in it for political reasons, mainly to avoid having it split island nations or contiguous areas of national interest.
Alaska and Hawaii. If you go to the mainland, then California, Oregon, and Washington are the closest.
No, the international date line is a line of longitude, not latitude.
ALASKA because some of alaska touchs the date line
If you choose to fly from Hawaii eastward to Okinawa, you never cross the International Dateline, so you've cleverly eliminated the whole problem.