b ands . ▁ ▁Some ▁independent ▁s tere o ▁manufact ur ers ▁including ▁J VC , ▁P ione er , ▁Ken wood , ▁Al pine , ▁Sony , ▁and ▁Har man ▁K ardon ▁also ▁have ▁i Pod - specific ▁integration ▁solutions . ▁Altern ative ▁connection ▁methods ▁include ▁adapter ▁k its ▁( that ▁use ▁the ▁c ass ette ▁deck ▁or ▁the ▁CD ▁chang er ▁port ), ▁audio ▁input ▁j acks , ▁and ▁FM ▁transmit ters ▁such ▁as ▁the ▁i T rip — although ▁personal ▁FM ▁transmit ters ▁are ▁illegal ▁in ▁some ▁countries . ▁Many ▁car ▁manufact ur ers ▁have ▁added ▁audio ▁input ▁j acks ▁as ▁standard . ▁ ▁Begin ning ▁in ▁mid - 2 0 0 7 , ▁four ▁major ▁air lines , ▁United , ▁Cont inental , ▁D elta , ▁and ▁Em ir ates , ▁reached ▁agre ements ▁to ▁install ▁i Pod ▁seat ▁connections . ▁The ▁free ▁service ▁will ▁allow ▁passengers ▁to ▁power ▁and ▁charge ▁an ▁i Pod , ▁and ▁view ▁video ▁and ▁music ▁libraries ▁on ▁individual ▁seat - back ▁displays . ▁Origin ally ▁K LM ▁and ▁Air ▁France ▁were ▁reported ▁to ▁be ▁part ▁of ▁the ▁deal ▁with ▁Apple , ▁but ▁they ▁later ▁released ▁statements ▁explaining ▁that ▁they ▁were ▁only ▁cont empl ating ▁the ▁possibility ▁of ▁incorpor ating ▁such ▁systems . ▁ ▁Software ▁ ▁The ▁i Pod ▁line ▁can ▁play ▁several ▁audio ▁file ▁formats ▁including ▁MP 3 , ▁A AC / M 4 A , ▁Prote cted ▁A AC , ▁A I FF , ▁W AV , ▁Aud ible ▁audio book , ▁and