Correction appended March 28, 2008

Heathrow Airport’s Terminal 5, designed by Rogers, Stirk, Harbour & Partners, officially opens tomorrow, providing air travellers with a more welcoming entry to London. It is the first new terminal at this airport, the world’s busiest, in more than two decades. But the building’s arrival comes amid growing concerns over Heathrow’s proposed future expansion plans—and a renewed appreciation of rail travel, embodied by St. Pancras International, which reopened last fall after an extensive refurbishment led by Rail Link Engineering and Ove Arup.