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.
LAWA's[2] release of Wednesday, May 13, 2026 says "This week, crews lifted and placed the final steel beam upon the terminal's new frame" without naming the day, so the pin takes the release date.
LAWA's[1] capital programme page lists the Terminal 4 topping-out and gives the current approved capital improvement programme as $23.3 billion.
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.