Most commercial flights, however, fly at 38,000 feet above the Class B maximum height and there is not a specific speed limit imposed. BA Captain Dave Thomas stated why they fly at this height: 'This sort of altitude is a good compromise between engine efficiency and aerodynamic efficiency for jet aircraft.
The most common cause of de Quervainâs tenosynovitis is chronic overuse of the wrist. Repetitive movements day after day cause irritation and pain. One common movement that causes it is lifting a child into a car seat. Another is lifting heavy grocery bags by the handles.
This is also known as de Quervain's tendinosis. It causes pain on the thumb side of the wrist. The pain may develop gradually or suddenly. It can travel the length of the thumb and up the forearm. If you have de Quervain's tendinitis, movements that can be painful include: 1  Making a fist.2  Grasping or holding objects. 3  Turning the wrist.arpal tunnel syndrome. This is one of the most common nerve disorders. It affects up to 3% of the American population. Carpal tunnel syndrome causes pain in the: 1  Palm and some fingers of the hand. 2  Wrist.