
Rent a PLANE, write it in the sky.
The Big Bang Theory Season 9, Episode 12

That nut job was telling everybody
on the PLANE he's an astronaut.
The Big Bang Theory Season 6, Episode 4

...by an inclined PLANE
wrapped helically around an axis?
The Big Bang Theory Season 4, Episode 5

You get in this PLANE
The Big Bang Theory Season 5, Episode 18

You owe me $3,000 for those
PLANE tickets to India!
The Big Bang Theory Season 12, Episode 15