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In general, yes you can carry an oxygen concentrator with you.
However, prior to making travel arrangements (so BEFORE YOU BUY TICKETS), contact the airline as each airline will have specific instructions/parameters that may affect the specific device that your wife utilizes.
The TSA has a helpful guide and information that provides you with additional information: http://blog.tsa.gov/2014/04/tsa-travel-tips-traveling-with-portable.html