Editing Checked baggage (section)

===Passenger-baggage reconciliation===
According to the rules of most air transportation authorities, such as the [[United States|U.S.]] [[Federal Aviation Administration]] and [[European Union]]'s [[Joint Aviation Authorities]], should passengers flying internationally with checked baggage fail to arrive at the departure gate before the flight is closed, that person's baggage must be retrieved from the aircraft hold before the flight is permitted to take off. For Singapore, passengers with prohibited items are required to take it out from the bags retrieved at the check-in counter, failing which the baggage will be flagged with prohibited items and will be dumped away before boarding. In the United States, this does not apply to domestic flights since all bags are required to go through explosive detection machines (EDS) prior to loading. Making sure passengers board flights onto which they have checked baggage is called "passenger-baggage reconciliation" and is accomplished automatically through two commercially available systems.<ref>{{cite web|url=https://www.iata.org/policy/Documents/baggage-reconciliation.pdf|title=Baggage reconciliation|publisher=[[International Air Transport Association|IATA]]|access-date=12 June 2018|archive-url=https://web.archive.org/web/20170713044235/http://www.iata.org/policy/Documents/baggage-reconciliation.pdf|archive-date=13 July 2017|url-status=dead}}</ref> The security presumption of passenger-baggage reconciliation is that terrorists will not want to kill themselves, and will not board an aircraft if they have caused a bomb to be placed in its hold. This presumption does not hold true of [[Suicide bombing|suicide bombers]].

Unaccompanied suitcases led to the downing of four flights, when a bomb inside the suitcase exploded:
*1983: [[Gulf Air Flight 771]]
*1985: [[Air India Flight 182]]
*1988: [[Pan Am Flight 103]]
*1989: [[UTA Flight 772]]