Originally Posted by Baradium

Yes. Look at FOM 3.4.1



The company WILL provide positive space travel if you meet the requirements. If you abuse it you can be booted out for future usage (key word is abuse here). This requires you to use the "Unable to commute" policy. Call-in-honest, which has different requirements, just prevents you from getting in trouble. You can use either one for a given trip, "unable to commute" requires that the second flight be a Delta branded flight for you to get positive space on while call-in-honest allows two flights from any airline.

Unable to commute is company provided while Call-in-honest is a contractual requirement.