Hazardous. By 1925, the first airlines had only just been established, and UK was within reach of continental Europe, but conditions were primitve by today's standards, fares could only be afforded by the wealthy, and safety was only just being recognised.
It depends you going from where to hajj. Generally, it is possible by air, by sea, or driving.
due to the presence of air and it cannot travel in a vaccum. Vaccum is a place where there is no air like space.
Despite having some disadvantages like high fuel price, expensive airline tickets, air travel still have more advantages than car, train, bus travel. At first its speed. For this reason air travel is the fastest way of travelling easily. Air travel is more safe and comfortable than other journey.
managing air travel
It's faster to travel by air.
The U.S. Air Force has numerous bases outside of the United States.
yes. At its powerfullest, electricity can travel through anything, like lightining through the air
by air.
No, sperm use a small whip-like tail to travel through a liquid medium. Also not just any liquid medium, it must be rather viscous for optimal travel, like that found in semen. The tail would be useless in air.
One could use Cheapflights to locate deals on air travel. Cheapflights searches many travel sites like Kayak and Priceline to bring the cheapest flights and travel deals to one place.
Cold air travel on north and south pole and warm air travel near equator
Sound needs to travel in medium like air, but there is no air in outer space, so sound is unable to travel. So basically sound needs air to travel, if there is no air sound cannot travel, when sound is unable to travel you cannot communicate (talk, speak, etc)