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$83B Wasted: Showing Up at the Airport 3 Hours Before Your Flight
(viewfromthewing.com)
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Hank Green had a quick video on this recently. Airports like LAX are laid out in such a way that it can take up to two hours to get from the curb to the gate. Rather than try to offer more targeted advice, passengers are just given a flat 2-3 hour number to ensure the majority of people will get in on time. It's overkill for most airports, but you need to do your due diligence
ETA: The mentioned video
I've had to walk down the 105 and all the way up sepulveda to catch a pre-xmas flight once. Wasn't the only one. This was a few years after 9/11 and they were still doing random checks on vehicles. Hate that airport. Worst I've been too in any country.