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Old 17th Jan 2015, 00:22
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Intruder
 
Join Date: May 2000
Location: Seattle
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On the 744/748 there are 2 places to input the call sign -- on the ACARS INITIAL DATA page and the FMS ROUTE page. IIRC, the former goes to ADSB/Mode S, and the latter goes to ADS-C/CPDLC/ATC Comm.
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