United Airlines will inaugurate service on April 3 to London's Heathrow Airport (April 4 for flights from London) with an initial schedule consisting of daily flights from New York's Kennedy Airport and Washington's Dulles Airport, and flights five days a week from San Francisco International Airport.

As part of the agreement whereby United acquired Pan Am's London Heathrow rights, United will honor all previously purchased Pan Am tickets, including discounts and special fares.Travel agents and United spokesmen suggest that Pan Am ticket holders call United, (800) 241-6522, for reconfirmation and further flight information.