Oman's transport ministry has announced passenger traffic at Muscat International Airport rose 15% to 2,040,917 passengers during the first four months of this year, compared with 1,773,374 passengers for the corresponding period in 2010, the Oman Daily Observer has reported. Salalah Airport achieved an 11% rise to 155,628 passengers during the same period, compared with 139,897 passengers during the corresponding period in 2010, the ministry said.