As ETOPS says, these photos were taken from a light aircraft, flying over LAX.
If you look in A.net under the name of Sam Chui, you'll find more photos like this, but WOW - this one is breathtaking! I'm sure there are others from Mr. Warner as well.
Just goes to show that no matter how much airport & aviation security tries to suppress it (not that they're going to have much luck at 2,000'!), there will always be a passion for aircraft photography as long as there are aircraft.
