Which letter prefix do most US airports use in their ICAO codes?

Which letter prefix do most US airports use in their ICAO codes?

• A. C
• B. K
• C. P
• D. E

Answer: (B)

ICAO airport codes are four-letter identifiers where the first letter (and sometimes the first two) signal the country or region. For the United States, the typical prefix you’ll see for most airports is the letter K. That means most US airports are coded with names like KLAX for Los Angeles or KJFK for New York’s JFK. There are a few notable exceptions to this pattern: Alaska uses prefixes starting with PA, and Hawaii uses prefixes starting with PH. These reflect historical coding choices, but they don’t change the fact that, in general, K is the standard prefix for US airports. So the most common prefix you’ll encounter in US ICAO codes is K.

ICAO airport codes are four-letter identifiers where the first letter (and sometimes the first two) signal the country or region. For the United States, the typical prefix you’ll see for most airports is the letter K. That means most US airports are coded with names like KLAX for Los Angeles or KJFK for New York’s JFK.

There are a few notable exceptions to this pattern: Alaska uses prefixes starting with PA, and Hawaii uses prefixes starting with PH. These reflect historical coding choices, but they don’t change the fact that, in general, K is the standard prefix for US airports. So the most common prefix you’ll encounter in US ICAO codes is K.