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.
So why do airlines have temperature restrictions? While many airlines have Weather Embargoes during the summer/winter months, it is not because of the cargo hold temperatures. Airlines that are not pet friendly take all of their cargo to the plane at one time. Animals often end up waiting on the tarmac while the cargo is loaded or unloaded.