The most common and most likely answer to this crossword clue is the 8 letter word SENTINEL which also is the latest solution we found used in New York Times in 1954.
U S observation plane crossword clue answers
Here's a list of possible crossword answers ranked by the most likely to least likely.
| Answer | Likelyness | Letters | 
|---|---|---|
| SENTINEL | 100 % | 8 | 
Words with a meaning similar to the clue: U S observation plane
These words may or may not be a possible solution to this crosswords clue.- elevation
 - depression
 - dip
 - circle
 - contact
 - contacts
 - level
 - median
 - nose
 - scout
 - trace
 - traces
 
Crossword Answer definitions
SENTINEL noun- A sentry, watch, or guard.
 - A private soldier.
 - A unique string of characters recognised by a computer program for processing in a special way; a keyword.
 - A sentinel crab.
 - A sign of a health risk (e.g. a disease, an adverse effect).
 
- To watch over as a guard.
 - To post as guard.
 - To post a guard for.
 
More crossword clues leading to the same solutions
Here's a few more crossword clues - all leading to the identical solution