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This is the link to TSA suggestions on 'flying with instruments';

http://www.tsa.gov/traveler-information ... nstruments

This is a recent article from Taylor Guitar referring same;

http://www.taylorguitars.com/blog/guita ... dium=email

I can't speak of other cases, but the one I have includes a "PEV" - "Pressure Equalization Valve". Probably a marketing gizmo but....