| 100% | NASA | 4 | Org. that flew a helicopter on Mars in 2021 |
| 44% | NASA | 4 | Org. whose Perseverance rover landed on Mars in February, 2021 |
| 43% | APRIL | 5 | Month in 2021 when NASA's Ingenuity became the first powered aircraft to fly on Mars |
| 39% | AUGUST | 6 | Only month that starts on a Sunday in 2021 |
| 39% | BAT | 3 | Animal that flies in a cave |
| 39% | GEESE | 5 | Birds that fly in a V |
| 38% | GEESE | 5 | Birds that fly in a V formation |
| 38% | GEESE | 5 | Waterfowl that fly in a V formation |
| 38% | GEESE | 5 | Birds that fly in a V-formation |
| 38% | GEESE | 5 | Migratory birds that fly in a V |
| 38% | GEESE | 5 | Those in a flying flock |
| 38% | PTA | 3 | Org. that might put on a school carnival |
| 38% | EPA | 3 | Org. that may be involved in a cleanup |
| 38% | GEESE | 5 | Canada ___ (birds that fly in a V formation) |
| 37% | BAT | 3 | Flying animal that lives in a cave |
| 37% | PTA | 3 | Org. that might sponsor a read-a-thon, in brief |
| 37% | TWIX | 4 | Mars candy that comes in a two-pack |
| 36% | BAT | 3 | Flying mammal that might roost in a cave |
| 36% | EPA | 3 | Org. that covers Springfield in a dome in "The Simpsons Movie" |
| 36% | TSA | 3 | Org. that might have you put your belt on a belt |
| 36% | AFC | 3 | Org. that a 9-Across will represent in Super Bowl LVIII |
| 36% | GOOSE | 5 | Honking bird that flies in a flock shaped like a letter |
| 36% | BLACKHAWK | 9 | Helicopter that was Down in a Ridley Scott movie |
| 36% | NRA | 3 | Org. that's a topic in "Bowling for Columbine" |
| 36% | NSA | 3 | Org. that maintains a museum in Annapolis Junction, Md. |
| 36% | FRISBEE | 7 | A flying disc that can be used in competitions |
| 36% | KITE | 4 | Plaything on a string that can fly |
| 36% | NCAA | 4 | Org. that was the subject of a 2021 Supreme Court antitrust ruling |
| 36% | XFL | 3 | Org. that kicked off again in 2020 after a 19-year hiatus |
| 35% | HONEYBEE | 8 | Flying insect that lives in a hive with its queen |