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One for aircraft if related (start typing in your aircraft name in the tag section and pick correct option)
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ISSUE DESCRIPTION
Description of the issue: In SU4 Beta v1.6.7.0, if any of the three (3) text fields on the “Aircraft identification” page of the configuration menu are changed and saved, all the other aircraft will inherit those same changes.
MODERATORS: Apologies if this is a duplicate report or not a regression in SU4 - I no longer have any older versions to check and it is the first time I modified these fields (changed the F-18 callsign to “AIR FORCE”, and then on next flight, my Cessna was involuntarily enlisted as a military aircraft 
FREQUENCY OF ISSUE
How often does this occur for you (Example: Just once, every time on sim load, intermittently)? Everytime
REPRODUCTION STEPS
Please list clear steps you took in order to help our test team reproduce the same issue:
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Select any aircraft in the Free Flight aircraft selection menu
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Click “Configure”, then “Identification”
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Assign a value to any of the following fields: “Tail number”, “Call sign”, or “Flight number”
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Click “Save and Back”
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Select any other aircraft in the Free Flight aircraft selection menu
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Click “Configure”, then “Identification”
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The values of the fields: “Tail number”, “Call sign”, or “Flight number” have now inherited those of the other aircraft modified.
YOUR SETTINGS
If the issue still occurs with no mods and add-ons, please continue to report your issue. If not, please move this post to the User Support Hub.
What peripherals are you using: Keyboard
[PC Only] Are you using Developer Mode or have you made any changes to it? No
[PC Only] What GPU (Graphics Card) do you use?
[PC Only] What other relevant PC specs can you share?
MEDIA
Please add a screenshot or video of the issue occurring.