However, to make it even more  confusing for all of you watching, retired passenger Boeing 747-400s  were retrofitted into cargo aircraft and created a stretched humped 747-400  Boeing Converted Freighter (BCF).

然而，为了让所有观看者更加困惑，退役的波音 747-400 客机被改装成货机，并创造了一个加长的驼峰 747-400 波音改装货机 (BCF)。