The airport remains open, but there are additional security procedures in place.

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Last year, researchers published a study suggesting the device could help prevent small heart attacks that occasionally occur in about 10% of procedures when stents are deployed to prop open diseased coronary arteries.

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The staff in the control tower have created new operating procedures to allow the airport to remain open to general aviation when drones are not taking off or landing.

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Each year, doctors in America perform about a million angioplasty procedures, using a balloon-tipped catheter to open clogged arteries and relieve chest pain.

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Military commission trials have been used in most American wars, and their rules and procedures are designed around the need to protect intelligence sources and methods from revelation in open court.

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