Don't fly the 747 but just a tiddly Canadair albeit with a noisy cockpit. Our company have a set of Sennheiser HMEC-25 headsets for evaluation but despite everyone liking them the company wouldn't shell out for them. Instead I used the earplug setup for a while but gave up as it was poor at best. Have to use the intercom for the HMEC25 to be at its best but it is good.