The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
Munich Airport's own history page and Wikipedia[3] both give 17 May 1992 as its opening date at the current site.
Skytrax confirms Munich as the only 5-Star rated airport in Europe.[1]
Wikipedia states Munich Airport opened on 17 May 1992 at its current location.
Something missing or wrong? Say it in your own words: a link that backs this pin up, a different start or end date and why, or a fact it lacks or gets wrong. The AI checks it against this pin's sources, searches for better ones, and adds any page that backs you up. The pin's own sources still count most.