While cotton, from the cotton plant, and linen, from the flax plant, are both natural plant fibers (cellulose), there are many differences between them. The term Linens can colloquially refer to any household good, but this should not be confused with linen fabric.
The NTSB defines an incident as an occurrence other than an accident, associated with the operation of an aircraft, which affects or could affect the safety of operations. While many incidents do not need to be reported to the NTSB, there are serious incidents that must be reported.
Note 2.-- An aircraft is considered to be missing when the official search has been terminated and the wreckage has not been located. Incident. An occurrence, other than an accident, associated with the operation of an aircraft which affects or could affect the safety of operation. There are indeed only two 'official' classifications of aviation incidents, which are defined in ICAO Annex 13. Accident.