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.
As of Mar 1st'2016, the longest commercial airline flight is Dubai-Auckland on an Airbus 380. Once Emirates starts the Dubai-Panama City flight later this year or in 2017, that will be the longest flight ever. The Dubai-Auckland flight has beaten the previous longest flight between Dallas and Sydney operated by Qantas.