Sitting for long periods in front of a computer, lifting 30 lbs., kneeling, crouching, stooping, climbing of stairs or ladders, balancing, reaching, handling, working at a height of 20 feet, exposure to various inclement environmental conditions (Station Observations). ATI is an FAR Part 121 charter airline headquartered in Wilmington, Ohio, and operates a worldwide fleet of Boeing 757 and 767 cargo and combi passenger aircraft.