Can you have it?

But…

Instead try…

Hot tub or Jacuzzi

Yes

The water weight will slow you down considerably (especially on a small plane) and cost you in fuel.

Showers, which are practical and increasingly common on jets, says the F.A.A.’s Chris Carter. New, fines sprays reduce the amount of water used.

Customized layout

To some extent

The F.A.A. is flexible on layout, but manufacturers often standardize placement of the electrical outlets, lighting, and air-conditioning.

Some manufacturers emphasize choice. Gulfstream installs wiring for a forward and an aft galley, so customers can pick; they can also mix and match arrangements of furniture.

Chandelier

Yes

Most corporate jets don’t have high enough ceilings; also, the swinging during takeoff and landing could be dangerous.

Modern light fittings. If you’re set on a chandelier, get a retractable one.

Mohair or cashmere couch

Yes

You’ll be reupholstering the couch after every journey; mohair and cashmere don’t wear well.

Most fabrics—leather, silk, cotton, and linen—can be made flame-retardant, as required by the F.A.A. Do blankets and pillows in the softer stuff.

Mahogany table

Yes

A solid-mahogany table or even solid-granite countertops are possible but will add weight.

A lighter-weight material or a veneer, available in woods including mahogany and teak, which will be glued onto an aluminum honeycomb board. Even a professional carpenter won’t be able to tell the difference.

Gold toilet

Yes

Gold is easily dented, not to mention heavy.

Gold fittings or gold leaf—they’re lighter and less prone to showing dings.

Fireplace or gas stove

No

No buts. Open flame will never be allowed on an aircraft.

An electric oven. Want to build a fire? Stay on the ground.