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[+] -14 points 10 months ago (5 children)
  • [–] 37 points 10 months ago (2 children)
  • [–] 24 points 10 months ago (1 child)

    It's the airport code. City starts with P, ends with D, X is just there if they build more airports in the future.

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  • [–] 11 points 10 months ago (2 children)

    Airport abbreviation probably

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  • [–] 4 points 10 months ago (2 children)

    I'm gonna start calling Chicago ORD from now on.

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  • [–] 4 points 10 months ago (1 child)

    Disappointed the Midway code is MDW so you can't call Chicago MID.

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  • [–] 4 points 10 months ago (2 children)

    Speaking of which, why is Los Angeles International Airport LAX, and not LAI or LAA?

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  • [–] 5 points 10 months ago (1 child)

    X means international I think

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  • [–] 2 points 10 months ago

    X is from when airport codes were two letters.

    The ICAO designator for all airports in the contiguous US starts with K, so it's full designator is KLAX. Same for KPDX.

    There are over 5,000 public use airports in the US. While not all of them start with K (some very small airports start with a number instead), all moderately sized or larger airports do.

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  • [–] 1 point 10 months ago

    LAA and LAI are currently taken by two other airports. Here's what I could find:

    You may wonder where the "X" comes from in the codes for Los Angeles International Airport (LAX), Phoenix Sky Harbor International Airport (PHX) and Portland International Airport (PDX). The Phoenix code finishing with an "X" seems logical, but the other airport codes seem pretty random.

    In fact, the "X" for LAX and PDX is merely an arbitrary placeholder, created by IATA in the 1940s when airport codes in the U.S. expanded from two to three letters.

    At the time, airports used the National Weather Service codes for cities — in this case, with the logical "LA" and "PD" designations. As the number of airports rapidly increased in the 1940s, IATA had to add an extra letter to existing airport codes to make room for new codes.

    For the sake of simplicity and not to confuse pilots or passengers with new letter combinations, IATA added an "X" to the end of the existing codes for Los Angeles, Phoenix, Portland and a number of smaller airports. And that's the way it remains today.

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  • [–] 9 points 10 months ago (1 child)

    Not sure what the “= =“ means, but PDX is the airport identifier for Portland. Portland is just “Portland international”. Sometimes the identifiers align closely with airport location or history, like ORD (Chicago) was built on “Orchard Place”, and Douglas manufactured aircraft at a facility there during WW2, so Orchard Douglas became ORD. Someplace like DFW is just Dallas + Fort Worth.

    Prob more than you wanted, but there you go.

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  • [–] 12 points 10 months ago (1 child)

    Math nerd to the rescue!

    “==“ is either math for constantly equal (there are no situations in which they are different) or programming for boolean equal, aka the question of are these two things equal.

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  • [–] 4 points 10 months ago (1 child)
  • [–] 4 points 10 months ago

    Moreover, in programming a single = sets the value on the left to the value on the right, while == (or in some languages ===) means to compare the values (and === is explicit).

    Then there are the various forms of not equal (!=) and greater than/less than or equal ( <=, >= )

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