The Comet that took to the skies that day in 1951, after a year of test flights, was of course not the first jet plane. It was in the year 1930 that an English. This paragraph is mostly about?

The paragraph is mostly about the Comet, a jet plane that took its first flight in 1951 after a year of test flights. It mentions that the Comet was not the first jet plane, as jet technology had been developed earlier, with an English jet plane being mentioned as early as 1930.