The then Trade Secretary Peter Shore conducted a review of the Government's aviation policy and in 1976 announced a new "spheres of influence" policy that ended dual designation for British airlines on all long-haul routes. It was no longer believed that competition was increasing the UK market share of the traffic. As a result, BA and BCal were no longer permitted to run competing scheduled services on long-haul routes, and BCal had to withdraw from the East African routes inherited from BUA as well as from the London—New York and London—Los Angeles routes. BCal lost its licences to New York, Los Angeles, Boston and Toronto – routes it had stopped running in 1974. It gained Lusaka (Zambia) In return, BCal became the sole British flag carrier to the entire South American mainland by taking over the former BA routes to Colombia, Peru and Venezuela. The net losses of revenues was about equal for the two airlines.