| Answer | Crossword Clue |
|---|---|
| ALFA | Code letter |
| DAH | Code letter |
| NAN | Code letter |
| DAH | Morse code letter |
| ZIPPLUSFOUR | Nine-digit letter code |
| ZIP | Code on a letter |
| TANGO | Code letter after Sierra |
| ZIP | ... code (number on a letter) |
| NAN | Code word for letter "n." |
| SUGAR | Code word for letter "s." |
| XTRA | Code word for a letter |
| ALFA | Code word for the letter "A" |
| DIT | Part of a Morse code letter |
| DAH | Morse code letter after dit-dit-dit |
| ESS | Morse code letter that looks like an ellipsis |
| UAL | Three-letter designator code for the largest carrier out of Denver Intl. |
