Dan,
While visiting your neighbourhood this past summer, I got a pair of custom-designed earplugs at the BMW rally in Salem. These are for motorcycling -- the main issue being wind noise, as well and the racket caused by car tires (my airhead has a suitably refeened exhaust note, and not a lot of engine noise). The outfit I bought them from fitted me on the spot, and the plugs were ready inside the hour. (They use a flexible plastic which reaches its "ready state" within the hour.) It's a California-based operation: bigearinc.com (Name lends itself to an earful of bad puns, ho ho ho, which those of us exposed to Noddy and Big Ears in our younger days will no doubt seize upon...) Their website invites readers to find a local retailer -- I didn't check that.
Anyway, I used them on my return journey of about 7,000 kms, and they work very well. I'd say that they block about 2/3 to 3/4 of wind and road noise, but (by design) not all. Blessed if I can remember how much they cost me -- $50, maybe? They're bigger than the standard cheapo items (company is called Big Ear, after all...) and come in several colours, the better not to lose them. Mine are a dreadful aqua-green, but then, I see them only when I'm looking for them, eh?
Of course, you can't use them and listen to music, etc. -- Ooops! Just saw your most recent post, so this info may not be of any use. I'll leave it as is, in case it's of use to other readers, or if you decide to skip the inflight music/movies etc.
Good luck!