"The flying conditions were good?"
"Perfect. Also, Purdy is above suspicion. He has been flying the mail on the western runs for three years. This is his first accident. He was carrying nothing of unusual value."
"Are there any local conditions unfavorable to flying?"
"None at all. It is much uninhabited country, but there is no reason why it shouldn't be safe country to fly over."
"There are some damnably unfavorable local conditions, Doctor, although I can't tell you what they are," broke in Operative Carnes of the United States Secret Service. "Dick Purdy was rather more than an acquaintance of mine. After he was lost I looked into the record of that section a little. It is known among aviators as 'The Port of Missing Planes.'"
"How did it get a name like that?"
"From the number of unexplained and unexplainable accidents that happen right there. Dugan of the air mail, was lost there last May. They found the mailbags where he had dropped them before he crashed, but they never found a trace of him or his plane."
"They didn't?"
"Not a trace. The same thing happened when Mayfield cracked in August. He made a jump and broke his neck in landing. He was found all right, but his ship wasn't. Trierson of the army, dropped there and his plane was never found. Neither was he. He was seen to go down in a forced landing. He was flying last in a formation. As soon as he went down the other ships turned back and circled over the ground where he should have fallen. They saw nothing. Search parties found no trace of either him or his ship. Those are the best known cases, but I have heard rumors of several private ships which have gone down in that district and have never been seen or heard of since."