If it's observed after it left the PLANE,
before it hits its target...
The Big Bang Theory Season 1, Episode 1
Okay. Now we've got an inclined PLANE.
The Big Bang Theory Season 1, Episode 2
and jump out
of the PLANE.
Yeah.
The Big Bang Theory Season 12, Episode 23
The salesman said
it could survive a PLANE crash, so...
The Big Bang Theory Season 10, Episode 23
...by an inclined PLANE
wrapped helically around an axis.
The Big Bang Theory Season 4, Episode 5