Stress
Does having to transport 100 fifty-pound bags from one plane to another, followed by fifty 100-pound bags from the second plane to a third, all in less than forty-five minutes, sound stressful to you? If it doesn't, we don't even want to think about what your daily life must be like.
This isn't your average busy office environment. You've got to constantly and consistently meet your deadlines while working under already intense conditions. You also have to do it while keeping an eye on your safety, because you probably don't want to get crushed by a plane.
Sounds stressful to us.