[article] A six-runway airport could be built in the Thames River estuary about 50 miles east of central London. That's the idea being floated by a consortium formed by London Mayor Boris Johnson, part of an effort to solve London's aviation capacity crunch. The group thinks an airport could be built within seven years at a price tag of about £47.3 billion ($76 billion). The new London aviation hub would be dubbed the London Britannia Airport and would be located on a man-made island created specifically for the airport, according to the Thames Estuary Research and Development (Testrad) consortium. The group was formed specifically to find options for an estuary airport, an idea that Johnson has backed for several years. Both the BBC and The Independent newspaper of London dubbed the proposed design as the "Boris Island" airport in their coverage of the latest design. Regardless of what it's called, finding a way to expand aviation capacity in London is becoming an increasingly urgent priority for the British capital.