Beware Call Sign Mismatch

Many volunteer pilots use special call signs on their volunteer flights. Whether you use the “Compassion” call sign (CMF) , “Angel Flight” (NGF), “Aerobridge” (BGE), “Pals Hope” (PLZ), or any other call sign that is not the aircraft’s registration number, you must be careful to avoid “Callsign Mismatch” (CSMM). CSMM is a problem for airliners, […]

Exchange Your Call Sign

Make a donation to ACA and you can upgrade the call sign number that was originally assigned to you for one of your choosing (availability permitting). All proceeds support our mission of promoting, supporting, and representing public benefit flying. Rules: Numbers only from one to four digits. No alphabetic characters are permitted. Numbers beginning with […]

The Great Call Sign Exchange

If you’d like to exchange your current call sign number for one that’s more meaningful to you, now is your chance! From September 17th through September 24, 2021, you have the opportunity to upgrade the call sign number that was originally assigned to you for one of your choosing (availability permitting). This one-time event is […]

Register for Call Sign

Get Your COMPASSION Call Sign Today   The COMPASSION call sign is intended to clearly identify routine ambulatory patient transport and other public service missions conducted by volunteers including: animal transport, environmental flights, disaster response and other non-profit flying that serves the public interest. Why Use COMPASSION? Register for Call Sign Frequently Asked Questions Identify […]

CMF History

Original 1999 Letter to Public Benefit Flying Groups and Pilots May 29, 1999 TO: Public Benefit Flying Organizations and Pilots RE: Call Sign COMPASSION and three-letter designator CMF Dear Friends, On the first of this month at the Air Care Alliance 1999 national conference in Kansas City I announced that at our request the FAA […]

CMF Call Sign FAQs

What is the COMPASSION Call Sign? The COMPASSION call sign and it’s three-letter designator CMF is intended to clearly identify routine ambulatory patient transport and other public service missions conducted by volunteers.The COMPASSION call sign was assigned to the Air Care Alliance as an organization that promotes public benefit flying in 1999. What are the […]

CMF Procedures

Public Benefit Flying Three-Letter Designator “CMF”and Associated Radiotelephony Call Sign “COMPASSION” New Procedures for Use by Authorized Groups and Their Pilots Author: Rol Murrow, Chairman Emeritus, Air Care Alliance Effective Date: November 4, 2019 Purpose: This document discusses the Air Care Alliance’s international aircraft call sign COMPASSION and its associated three-letter designator CMF, describes the […]