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.
Happened as dated, per airforcetimes.com: "two 747-8 jets, will begin transitioning to the Air Force One configuration in 20…"
CNBC reports the White House announced its $3.9 billion agreement with Boeing for two new Air Force One 747-8s (VC-25B) on 27 February 2018, quoting the deputy press secretary directly - the actual 'deal to purchase two new aircraft' the pin describes, nearly seven years before the pin's stored 31 December 2024 date.
Defense News, a leading defense trade publication, independently corroborates the 27 February 2018 announcement of the fixed-price Air Force One deal.
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