Why do small private jets fly higher than commercial airliners?

I was just hanging out in FR24 and everytime I saw a Gulfstream there were flying above FL420. Often FL450. Why do these small jet (private jets) fly higher than comercial jets?

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Lol you made me smile. Thanks!

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Efficiency according to National Geographic’s Mayday air crash investigation

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Lower wing loading, so they can fly higher.

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@British-Airways… Exceptional!. Pls send me the actual-originator by PM.

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