British Airways has announced the extension of its 75th anniversary sale to next Wednesday, July 4.As announced, World Traveller economy fares begin at $975 including all taxes, fees and charges. Fares in World Traveller Plus, the airline’s premium economy, begin from $1,675 including all taxes, fees and charges.Roundtrip fares must be booked seven days in advance. Weekend travel is an additional $50 roundtrip. Minimum stay is over a Saturday and changes can be made for $275.Tickets can be booked by phoning the toll-free number 1-800-AIRWAYS, visiting the airline’s website at www.ba.com, or through local travel agents.