In the winter go to Imperial Hill. In-N-Out is backlit this time of year.
Here is an overview of the In-N-Out location while landing on the North Runways 24R/L You can spot from In-N-Out or the park area at the bottom of the photo but avoid the parking garage.
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Photo © Andrew Brescini
Oh, it's a big pretty white plane with red stripes, curtains in the windows and wheels and it looks like a big Tylenol.