These two kinds of aircraft can be dangerous to each other. That's why airplanes work on one side of a fire and helicopters on the other. They never work close together. Cleanup after a fire is also important. Firefighters with shovels look for hot spots that could burn again. Heat-sensing aircraft fly over, and crews check on equipment There are many with fire extinguishers on their backs. They look for small fires that might grow fast if the wind starts to blow. Controlling fires in the long, hot summer is hot, hard work.