If they are, I didn’t group my words well.

The problem with the original statement was that it was ambiguous: it could have been read as either of these:

1. GS (instruments) in Y
2. OP
3. All other passengers

or

1. GS instruments from P+/Y
2. Non-GS instruments in P+
3. OP
4. Non-GS instruments in Y

The second order is correct, but you can parse Kacee’s statement as meaning the first order. That was the intent of my first grouping — upon further review, maybe I should have written it like this; “Everyone (except for GS in Y)”