TEHRAN, July 09 (ISNA)-Iran has successfully overhauled five 747 Bowings. This is while before this, Iranian airlines had to send their planes to foreign companies, but today Iran has gained the ability to carryout this service with much lower expenses. "Of course we can not deny the negative effects of the placed airplane part sanctions, but we have removed many of the obstacles through the aid of airlines," said the executing company's manager.