| Answer | Crossword Clue |
|---|---|
| SATURN | Galileo was the first to observe its rings |
| COLUMBUSDAY | Colorado, in 1905, was the first state to observe it |
| ERIECANAL | The Seneca Chief was the first to travel its full length |
| ERIECANAL | The Seneca Chief was the first vessel to travel its entire length |
| ERNANI | Verdi work that was the first opera to be recorded in its entirety |
| ELAL | Its first flight was from Geneva to Tel Aviv |
