 Although BUA's services preceded BEA's and British Eagle's by four months, this occasion marked the first time jets were used to operate scheduled services on a domestic trunk route from Heathrow.It also marked the first time parallel jet competition was introduced on a UK domestic trunk route, as well as the fourth time such competition was introduced anywhere.British Eagle initially operated its scheduled domestic jet services with a pair of 200 series One-Elevens leased from the Central African Airways, pending delivery of the UK carrier's first three One-Eleven 300s between the end of May and July.