[custom_adv] Women have been involved in aviation from the beginnings of both lighter-than air travel and as airplanes, helicopters and space travel were developed. Women pilots were also called. [custom_adv] Women who have been successful in various aviation fields have served as mentors to younger women, helping them along in their careers. [custom_adv] Within the first two decades of powered flight, women on every continent except Antarctica had begun to fly, perform in aerial shows, parachute, and even transport passengers. [custom_adv] In the 1950s and 1960s, women were primarily restricted to serving in support fields such as flight simulation training, air traffic control, and as flight attendants. Since the 1970s, women have been allowed to participate in military service in most countries. [custom_adv] Women's participation in the field of aviation has increased over the years. In the United States, in 1930, there were around 200 women pilots but in five years there were more than 700.