Editing Mayday (section)

===Declaring emergency===
Sometimes the phrase "declaring emergency" is used in aviation, as an alternative to calling "mayday".<ref>{{cite web|url=http://www.ntsb.gov/ntsb/GenPDF.asp?id=DCA05MA003&rpt=fa|archive-url=https://web.archive.org/web/20100915034443/http://www.ntsb.gov/ntsb/GenPDF.asp?id=DCA05MA003&rpt=fa|title=National Transportation Safety Board FACTUAL REPORT AVIATION|url-status=dead|archive-date=15 September 2010|date=15 September 2010}}</ref> For example, in 1998 [[Swissair Flight 111]] radioed "Swissair one-eleven [[Heavy (aviation)|heavy]] is declaring emergency" after their situation had worsened, upgrading from the "pan-pan" which was declared earlier.<ref>{{cite web|url=https://aviation-safety.net/investigation/cvr/transcripts/atc_sr111.php|title=Aviation Safety Network > Accident investigation > CVR / FDR > Transcripts > ATC transcript Swissair Flight 111 - 02 SEP 1998|first=Harro|last=Ranter|website=aviation-safety.net|access-date=10 February 2019|archive-date=25 August 2019|archive-url=https://web.archive.org/web/20190825144346/https://aviation-safety.net/investigation/cvr/transcripts/atc_sr111.php|url-status=live}}</ref>

However, the [[International Civil Aviation Organization]] recommends the use of the standard "pan-pan" and "mayday" calls instead of "declaring an emergency".<ref>{{cite web|title=ICAO Standard Phraseology|url=http://www.skybrary.aero/bookshelf/books/115.pdf|work=SKYbrary|access-date=13 June 2013|archive-date=29 December 2018|archive-url=https://web.archive.org/web/20181229072920/https://www.skybrary.aero/bookshelf/books/115.pdf|url-status=live}}</ref> Cases of pilots using phrases other than "pan-pan" and "mayday" have caused confusion and errors in aircraft handling.<ref>{{cite web|title=Aircraft Fuel Status and Communication Procedures|url=http://www.hkatc.gov.hk/HK_AIP/aic/AIC21-12.pdf|publisher=Hong Kong Civil Aviation Department|access-date=13 June 2013|archive-date=8 August 2017|archive-url=https://web.archive.org/web/20170808151554/http://www.hkatc.gov.hk/HK_AIP/aic/AIC21-12.pdf|url-status=dead}}</ref>