Many doctors believe this decline in hormone levels triggers the symptoms of PMS. Changes in brain chemicals or deficiencies in certain vitamins and minerals may also play a role. Too many salty foods, alcohol, or caffeine may make symptoms worse as well.
There have been countless flights made since the invention of the airplane by the Wright Brothers in 1903. It should come as no surprise that the first commercial flight in history occurred in the United States. In fact, it occurred on January 1, 1914, three years before the United States entered the first World War.
Record Holder. The record for the longest single commercial flight was set by the currently discontinued Singapore Airlines service between Singapore and the U.S., clocking in at 18 hours and 9,535 miles to Newark. The 8,770 mile route to Los Angeles took half an hour longer and held the record for the longest flight time.