| Answer | Crossword Clue |
|---|---|
| REQ | Not an elective: Abbr. |
| REQUIRED | Not an elective course. |
| REQ | Not elective: Abbr. |
| REQ | Not elective, as a class: Abbr. |
| STD | Not an upgrade: Abbr. |
| EST | Not an exact amount: Abbr. |
| STOL | Abbr. for an aircraft not needing a long runway |
