For the plane ride go with the nice noise canceling earbuds if you want to listen to music or the tv. Or just get cheap foam plugs and toss them.
For the game and for any actual shooting the real deal is your only choice. I prefer over the ear muffs instead of the in the ear plugs.
If it's airsoft only then this should be more than enough. I've had a set for over a year and it's still ticking along.
http://airsoftdepot.ca/catalog/produ...oducts_id=1706