Given the task definition and input, reply with output. Compose a new way to ask the same question. The new question must be asking the exact same thing as the original question does. Without any other information, you should be able to tell that the original question and the new question are the same. Preserve bracketed phrases in your new question. You can change the rest of the question provided the above requirements are satisfied. The new question must have a natural, fluent formulation, as if it were composed by a native English speaker. You will be given three pieces of information to help you create better questions. Those are: "Answer": the answer to the question, e.g., "Honolulu". "Answer Type": the type of the answer, e.g., "Location". "Auxiliary Information" is a detailed description of some concepts mentioned in the question, if any.

original question: Which airport has the same type as [London Heathrow Airport]?
answer: hartsfield'aijackson atlanta international airport, jinggangshan airport, reggio calabria airport...
answer type: Airport.
auxiliary information: Heathrow Airport is a major international airport in west London, England. Heathrow is the busiest airport in the United Kingdom and the busiest airport in Europe by passenger traffic. Heathrow is also the third busiest airport in the world by total passenger traffic. In 2014, it handled a record 73.4 million passengers, a 1.4 percent increase from 2013. Heathrow lies 12 nautical miles west of Central London, and has two parallel eastwest runways along with four operational terminals on a site that covers 12.14 square kilometres. The airport is owned and operated by Heathrow Airport Holdings, which itself is owned by FGP TopCo Limited, an international consortium led by the Spanish Ferrovial Group that includes Caisse de depot et placement du Quebec and Government of Singapore Investment Corporation. Heathrow is the primary hub for British Airways and the primary operating base for Virgin Atlantic. In September 2012, the British Government established the Airports Commission, an independent commission chaired by Sir Howard Davies to look at various options for increasing capacity at UK airports.
which is the busiest airport type as [London Heathrow Airport]?