"Flight 643" is a single which appeared in DJ Tiësto's first album, In My Memory. In 2001 it was included as a B-side of "Urban Train", later released as an A-Side single. In 2006 it became B-side of "Lethal Industry" as a remix by Richard Durand.
The song had great success that it was adapted with vocals by Suzanne Palmer in 2002, it was also released as a single and titled "643 (Love's on Fire)".
The name Flight 643 is derived from KLM Royal Dutch Airlines flight number KL643, which is a non-stop service between Amsterdam and New York JFK. The big room house DJ John Christian made a rework of the track in October 2013 and got his version released on Tiësto's new label, Musical Freedom.
It's featured in the soundtrack for the 2001 videogame FIFA Football 2002.