Nation: The Defense Is Not Ironclad

It certainly isn't, as "pot planes"enter U.S. airspace undetected

One afternoon last week a crew of Colombians began loading bales of unlabeled cargo into a four-engine DC-7 at Curaçao airport in the Dutch Antilles. That night the lumbering 22-year-old plane took off for what the crew said was a local test run to tune up its engines.

Instead the ancient Douglas headed north over the Gulf of Mexico, flying through the night with no approved flight plan or warning lights and maintaining radio silence. Neither the Federal Aviation Administration nor the North American Air Defense...

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