 Dan-Air's acquisition of its first two BAC One-Elevens from American Airlines in 1969 necessitated a major modification programme at Lasham before these aircraft could join the UK civil aircraft register as these were 400 series models that had been built to comply with US airworthiness requirements, which differed in several important aspects from the UK's airworthiness requirements.The introduction of Dan-Air's first American-built jet aircraft, an ex-Pan Am Boeing 707 320 series "Intercontinental", in 1971 eventually led to Dan-Air Engineering being granted "FAA Repair Station" status.This meant that it could perform maintenance, repair and overhaul (MRO) tasks on aircraft that were on the US civil aircraft register and/or were governed by US airworthiness standards.