Aerial Survey
These companies use aircraft equipped with sophisticated aerial imaging equipment to provide data for maps, security, and other services. They are great for time-building and often have mixed fleets of single-engine aircraft and multi-engine aircraft. It's common for them to have rotational schedules which allow location flexibility.
Part 141 Flight Schools
If you are a CFI looking for work, this list is a great place to help you find schools in your area. These are the Part 141 Flight Schools registered with the FAA. Use this list as a jumping off point for getting connected with these companies. As you can see, there are hundreds in the US.
Skydiving
Though time-building is often slower than some other options, there are a ton of skydiving operations in the United States. Use this list as a starting place to contact companies and inquire about job opportunities. Some hire pilots directly and others hire contract pilots from nearby operators.