In February 2001, Atlas Air Worldwide was formed as the holding company structure with Atlas Air, Polar Air Cargo, and Titan Aviation as its subsidiaries. Data from Ch-aviation shows that the 747-400 fleet is composed of five Boeing 747-400 passenger aircraft, two Boeing 747-400BCFs (Boeing Converted Freighters), two Boeing 747-400BDSFs (Bedek Special Freighters), four Boeing 747-400LCFs (Large Cargo Freighters, i.e., Dreamlifters), two Boeing 747-400ERF (Extended Range Freighters), and 32 Boeing 747-400FSCDs (Freighter - FSCD variants). Atlas Air Jumbo subtype Number in inventory (per ch-aviation) Boeing 747-400 passenger 5 Boeing 747-400BCF 2 Boeing 747-400BDSF 2 Boeing 747-400LCF 4 Boeing 747-400ERF 2 Boeing 747-400FSCD 32 Boeing 747-8F 17 (inc. 2 wet leased in)The 17-strong Boeing 747-8 fleet is completely 747-8 Freighters, of which two are wet leased. The 747-400 fleet is now on average 25.9 years old, while the 747-8 fleet is 10.6 years old on average. Boeing records show it delivered a total of 29 Boeing 747s to Atlas Air (including Atlas Air Worldwide Holdings).