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Old 12th Jul 2021, 03:32
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Lead Balloon
 
Join Date: Nov 2001
Location: Australia/India
Posts: 5,296
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I don't think the location codes for aerodromes changed as early as 1988. (It might have for international flights...).

For example, the Autumn 1990 Aviation Safety Digest quiz question 7 opens with: "You are planning a flight to Melbourne (AMML) with an ETA of 0500UTC."

I think the changes (at least for pilots filling out flight plans and getting forecasts and NOTAMS through the system) changed in around December 91?
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