The following are FCC Standards for slate letter codes. Note that the letters I and O are not used because they too closely resemble the numbers 1 and 0.

A ALPHA	B BRAVO	C CHARLIE
D DELTA	E ECHO	F FOXTROT
G GOLF	H HOTEL	J JULIETTE
K KILO	L LIMA	M MIKE
N NOVEMBER	P POPPA	Q QUEBEC
R ROMEO	S SIERRA	T TANGO
U UNIFORM	V VICTOR	W WHISKEY
X X-RAY	Y YANKEE	Z ZULU

After “Z”, the lettering goes as follows:

• AA, AB, AC, AD…AZ
• BA, BB, BC, BD, …BZ and so on.