The crash most dreaded by airmail men is the one that ends in fire. Unless the pilot can extricate the bags from the flames, the mail is surely lost, there being no perfected means of dumping the bags in flight in an emergency.* Post Office officials eyed with interest an experiment begun last week by National Air Transport and Railway Express Agency, with a fireproof and heat-proof cargo pouch developed by Johns-Manville Corp. This new bag was said to withstand a fire hot enough to melt sheet-metal...

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