<s>
The	O
Common	B-Protocol
ICAO	I-Protocol
Data	I-Protocol
Interchange	I-Protocol
Network	I-Protocol
(	O
CIDIN	B-Protocol
)	O
is	O
a	O
network	O
,	O
run	O
by	O
the	O
International	B-General_Concept
Civil	I-General_Concept
Aviation	I-General_Concept
Organization	I-General_Concept
(	O
ICAO	O
)	O
,	O
which	O
makes	O
up	O
part	O
of	O
the	O
aeronautical	O
fixed	O
service	O
.	O
</s>
<s>
It	O
is	O
used	O
to	O
transmit	O
text	O
or	O
binary	O
messages	O
for	O
the	O
purposes	O
of	O
air	B-Application
traffic	I-Application
control	I-Application
.	O
</s>
