Thermostats and jet engines seem worlds apart, but they're the wind beneath Honeywell International's wings. More than a century old, the company is a diverse industrial conglomerate with four segments; the largest are Automation and Control Solutions (ACS -- making HVAC and manufacturing process products) and Aerospace (turbo engines and flight safety and landing systems). Additional segments include Performance Materials and Technology (PMT, formerly Honeywell Specialty Materials, thermal switches, fibers, and chemicals) and Transportation Systems (engine boosting systems and brake materials).