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The current record for longest commercial flight is 21,602.22km by Boeing 777-200LR.

However the designed maximum range for B777-200LR is 15,800 km. So how is this possible?

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  • $\begingroup$ You may find this question, or better the answers below it, helpful. $\endgroup$ Oct 4 '15 at 16:59
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The design range is fully loaded. This flight had 35 passengers, no cargo, full fuel and was run as a project and flown by a test pilot. It was not a commercial flight in the meaning that most people would recognise.

They had to wait for weeks until the winds aloft, especially the jet stream, were at their most advantageous.

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  • $\begingroup$ and they used higher-density fuel. See here (PDF) for specs. $\endgroup$ Oct 4 '15 at 17:03
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The designed maximum range is just a number, it is affected by a number of constrained factor like fuels and payload as wells as unconstrained factor like jet-steam.

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