| http://www.w3.org/ns/prov#value | - Quoting Commavia (Reply 1):st major U.S. airlines used to have multiple large maintenance bases around the country, but today, all U.S. carriers except AA outsource their heavy overhauls, While alot of people think that overhauls are the dividing line between outsourced and in-house maintenance, DOT statistics show that AA contracts out more than 30% of its maintenance so they certainly subcontrac
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