"Any communications you send to this Portal or otherwise to United Airlines, Inc. by electronic mail are on a non-confidential basis, and United Airlines, Inc. is under no obligation to refrain from reproducing, publishing or otherwise using them in any way for any purpose."

"United Airlines, Inc. shall be free to use the content of such electronic mail communications, including any ideas, inventions, concepts, techniques or know-how disclosed therein, for any purpose, including the developing, manufacturing and/or marketing of goods or services."

Taken from 'use of information' section of their terms @ http://www.united.com/web/en-US/content/travel/inflight/wifi/terms.aspx