intr. & tr.v. de·planed, de·plan·ing, de·planes
To leave or cause to leave an airplane.
American Heritage® Dictionary of the English Language, Fifth Edition. (2011)
How to Speak Airline: A Glossary For Travelers
• DEPLANE “Please remember to take all of your belongings before deplaning.”
Meaning: Deplane is used to describe the opposite of boarding an aircraft. There are those who feel the root “plane” should not be used as a verb, fearing a chain-reaction of abominable copycats. Imagine “decar” for getting out of your car, or “debed” for waking up. In fact, dictionaries date “deplane” to the 1920s, and while it’s not the slickest sounding word, I’m known to employ it myself. Like “stewardess,” it’s a term of occasional convenience. There are few snappy, PA-friendly options with the same useful meaning. “Disembark” is the most elegant one, and it’s rather clumsy.
A stupid term used by North Americans. It is commonly used in commercial airline flights and is said (usually by the pilot or stewards) when it is time to get off the plane. [...]