Owning the planet’s biggest superyacht is so passé.

Today, you’re nothing unless you dump cash into a private plane or two – or 38, as King Rama X of Thailand recently revealed .

And even then, you’d better hire the very best interior designer to kit it out to your perfect spec.

Nearly anything goes, no matter how extravagant or bizarre the request — and at whatever the cost. 24

Sarah Mespelt Larranaga, a specialist in private plane interior design, told The Post that “design and oversight” can cost her clients between $150,000 and $200,000, depending on the length of the project.

But the real whopper, according to Larranaga, is the actual refurbishment, which on average can run an eye-watering $2 million to $5 million.

If you are spending big on your own jet – the popula

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