"IN PLANE SIGHT"
How many Lostaways gasped when they saw that opening shot in this 'Castle' episode?
Oceanic Airways is already a member of the Television Crossover Hall Of Fame thanks to its many appearances on TV even before 'Lost' first aired. But the airline is earning its keep still, it seems.
However this is just another example of Oceanic's existence, but not an actual connection to 'Lost' or most of those other appearances. 'Lost' took place in Earth Prime-Time while the dimension for 'Castle' (currently dubbed "Castleworld") is different because it has a different Mayor in New York City than Toobworld or the real world. (Bill DeBlasio is acknowledged as the Mayor in at least two TV series set in Toobworld so far.)