The aircraft with manufacturer serial number 18420 and line number 243 is a Boeing 720-051B. It had its maiden flight on 1961-10-31. The last recordered registration was SX-DBL. The airframe is scrapped.
History:
Northwest Airlines, from 25th of October 1961, registered as N727US Olympic Airways, from 6th of February 1972, registered as SX-DBL