At the equator, the time zones are a little over 1,000 miles (1,609 km) apart, so to cross one every hour, your plane would have to fly at over 1,000 miles per hour (1,609 kph). If you started flying at 12:00 noon, at 1:00 p.m. (according to your watch) you would cross a time zone, making it 12:00 noon again.