Inability of an individual or a group to perform the given tasks up to the established standards. http://www.businessdictionary.com/definition/deficiency-performance.html.
TSA Requirements. The TSA requires that adult passengers ages 18 and older show valid photo ID at the security checkpoint. Children, however, are not required to present such identification. This does not mean, however, that children will be able to fly without it.
Airline Identification Requirements. Airlines do not typically require identification from passengers under the age of 18, but there are exceptions. Children under the age of 2 may ride on a parentâs lap without purchasing a ticket, but the airline will require identification, such as a birth certificate, to prove the childâs date of birth.