CASAA is the centralized application to Anesthesiology Assistant programs. Some programs may have supplemental materials. Be sure to check each program's requirements.
The CASAA application is available each year beginning in early June. Deadlines will depend upon the schools but are generally October-December. Admissions offers are extended December-June.
The CASAA application can be found here.
The CASAA is a service of the Association of Anesthesiologist Assistant Program Directors (AAAPD).