( LEAD ) Customs officials find suspected smuggled goods at Korean Air ' s subcontractor ( ATTN : ADDS details in last 3 paras ) SEJONG , May 21 ( Yonhap ) -- Customs authorities said Monday its officials raided a subcontractor of Korean Air Lines Co . and found 2 . 5 tons of suspected smuggled goods , as the airline ' s founding family faces a probe for illegally bringing in luxury goods . The Korea Customs Service ( KCS ) has been looking into allegations that Korean Air Chairman Cho Yang - ho ' s family smuggled certain goods without paying due taxes while reportedly disguising them as corporate assets . The nature of the smuggled goods was not immediately made known . The subcontractor supplies in - flight meals to Korean Air , according to KCS officials . This composite file image shows Korean Air chief Cho Yang - ho ( L ) , his wife Lee Myung - hee ( R ) and Cho Hyun - min . ( Yonhap ) The Cho family has been under a series of investigations after the chairman ' s youngest daughter , Cho Hyun - min , a former executive of Korean Air , was accused of allegedly assaulting ad agency officials . Hyun - min is the younger sister of Cho Hyun - ah , who gained global notoriety for the " nut rage " incident in 2014 . She forced a plane back to the boarding gate at New York ' s John F . Kennedy International Airport because she was upset with the way her nuts were served -- in an unopened bag instead of on a plate . Smuggling is an offense that carries a maximum sentence of five years in prison and fines up to 10 times the duties evaded . Monday ' s raid by the KCS is the fifth conducted on the national flag carrier . KCS officials said Monday ' s raid was carried out based on an analysis of telecommunications records between Korean Air and the subcontractor . The KCS is expected to summon members of the Cho family after determining the origin of the suspected smuggled goods . ( END )