AVIATION: The Jet Race

A year ago there were only three U.S. airlines operating pure jets, and their pace-setting handful of the swift new giants invariably took off with nearly every seat filled. Today, ten U.S. carriers fly a combined fleet of 92 Boeing 707s and DC-8s, with more being rapidly delivered. Despite the increased competition and the fact that stormy January, in the words of a TWA officer, is "one month the airlines would like to forget," last month's load figures show the jets still astonishingly popular with travelers.

TWA and American Airlines, which operate competitive...