APCO Reply Comments: NG9-1-1 Interoperability and Reliability https://www.apcointl.org/~documents/filing/apco-reply-comments-ng911-reliability-interoperability-0917025?layout=file
APCO Reply Comments on Amending the FCC’s Technical Rules Governing Commercial Aviation Air-Ground Systems in the 849-851 and 894-896 MHz Bands