The hot and humid air produced by the airplane's engine mixes with the cool and dry air outside of the airplane, resulting in the formation of contrails. In other words, contrails are condensation in the sky that manifest as white smoke.
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Most airplanes leave behind a white smoke trail, though some may leave behind a black smoke trail. Black smoke trails aren't caused by condensation in exhaust gases. Instead, they are caused by an incomplete combustion processes. Just like cars and trucks use combustion to produce power, so do airplanes.
While No Smoking signs are certainly there as a constant reminder that smoking is not allowed on board, the signs are also because of convenience and cost. Airlines, like other private businesses, must reinforce federal laws with signage, such as No Smoking signs (via mydoorsign.com).
While fuel dumps don't happen every day, they're also not uncommon. Nor do they usually represent a major emergency. In fact if an aircraft is taking the time to dump fuel before landing, that's likely an indication that the issue forcing the plane to land is serious but not critical.
Question: Captain Cox, why is smoke seen when an aircraft's landing wheels touch down onto the runway? Answer: The smoke is the result of a wheel which is not turning in flight making contact with a stationary runway. The wheel must accelerate to the landing speed very quickly.
Some aircraft damage from lightning strikes includes broken lighting and windows, deformed antenna placements, and onboard electronics malfunctions. Other abnormalities or warnings on the flight deck, such as cabin air pressurization problems or false alarms, can occur after your airplane has been struck by lightning.
Swap Smoking for SnacksKeeping your hands and mouth occupied is often the key to cutting down unwanted cravings. Hard-boiled sweets, mints or toffees are good choices as they take a while to suck on or chew – regular or nicotine gum is also a good option.
Pilots can and sometimes do smoke in the cockpits of business jets. These can be as large as airliners (see BBJ), but usually aren't. Even when a country and/or airline ban smoking in the flight deck, some pilots will ignore the ban and still light up.
As of 2000, federal law prohibit smoking on all domestic commercial airlines, despite the fact that, by law, commercial airliners must still have an ashtray installed inside of their lavatories.