Like repeated jet travel, frequent drastic changes in working hours are likely to cause stress on the body and brain.

Those donations included private jet travel, helicopter rides and cash.

It was that significant; a new everyday miracle to compare with the dawn of jet travel half a century earlier.

Supersonic jet travel must have sounded like a brilliant idea a few decades ago.

The change began in the early 1950s with the precipitous decline of the railroad to competition from the automobile and jet travel.