Lufthansa allows frequent flyer members to use their miles to upgrade to a higher class of service, making it a great way to leverage accumulated rewards. You can use miles to upgrade from Economy to Premium Economy, or from Premium Economy to Business or First Class, depending on availability. The number of miles required varies by route, class of service, and availability, so it’s important to plan ahead and check the upgrade availability when booking. Using miles for an upgrade can add significant value to your travel, especially for long-haul flights where the comfort of a Business or First Class seat is highly desirable.

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Details on Hawaiian Airlines Flight Change Policy -
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Details on Hawaiian Airlines Flight Change Policy -

Travel plans can always change due to a wrong booking or a change in plans. Now, if you don't have any fixed travel plans, then through  Hawaiian