MDA is a man-made (synthetic) recreational drug noted for its stimulant and psychedelic properties that has been used since the 1960s as a clubbing and sex-enhancing substance, with some similarities to LSD and MDMA (ecstasy). Sought after effects.
The soaring temperatures that Las Vegas is experiencing this week could cause grief for pilots at other airports, because heat thins the air and makes it more difficult for aircraft to lift at take-off. To deal with that, pilots need to gain more momentum as they roll down the runway before reaching liftoff speed.
Most airplanes flight manuals require fuel pumps off after engine shutdown and on only before departure. Usually they don`t explain why they should be off for refuelling. I remember reading somewhere that having the fuel system pressurized will increase refuelling time, but I don`t remember where I read that!