Commercial passenger planes do not typically have washers and dryers on board. The limited space and weight restrictions on aircraft make it impractical to install laundry facilities. Additionally, the resources required for water supply, drainage, and energy consumption would be significant.
Instead, airlines rely on offsite laundry facilities and processes to ensure that passengers' blankets, pillows, and other reusable items are cleaned and refreshed between flights. These items are usually collected at the end of a flight and sent to the airline's laundry facility for cleaning. Airlines have established processes and partnerships with professional laundry services to efficiently handle the cleaning and maintenance of these items.
For shorter flights, where passengers' personal clothing is not typically changed or laundered on board, airlines do not provide laundry facilities. Passengers are responsible for laundering their personal items before or after their journey. Some airlines may offer laundry services for premium or long-haul passengers, but these are usually limited to specific classes or circumstances.
It's worth noting that some larger private or executive aircraft may have laundry facilities on board, especially those used for long-duration flights or by individuals or organizations with specific needs. However, this is not a standard feature on most commercial passenger planes.