RollerCoaster Tycoon's first expansion is known as Corkscrew Follies (CF) or in the UK and Australia, Added Attractions (AA). It is normally noted as CF/AA. The only difference between the two is the name. CF included over two dozen new scenarios, stalls, shops, rollercoaster types, and some new scenery/themes.
The second expansion for RollerCoaster Tycoon is Loopy Landscapes (LL). The LL expansion includes the CF/AA expansion. LL provides new landscapes, stalls, shops, rides, and 30 new scenarios.