Imran Khan skips helicopter case hearingPESHAWAR: The National Accountability Bureau (NAB) on Wednesday summoned Imran Khan in connection with a case pertaining to misuseof government helicopter.According to TV reports, the Pakistan Tehreek-e-Insaf (PTI) chairman failed to appear before the anti-graft body.No formal statement was issued by the PTI with regards to the today's summons.NAB chairman Justice (retd) Javed Iqbal on February 2 had ordered an inquiry against the PTI chairman for using two KPK government helicopters on lower rates.According to Geo News, Khan was arsed to appear before the NAB on July 18.Sources said the NAB had prepared a questionnaire for Imran Khan.In a statement issued by the NAB, it was stated that Imran Khan had used MI-17 helicopter for 22 hours and another for 52 hours paying only 2170181, Rs28,000 per hour on average.