Furthermore, disruptive innovations might negatively impact air cargo volumes. 3D printing that might reduce the number of shipped parts and supplies, crowd shipping services that connect people who want to ship something with travelers are other areas to watch. The rapid and continual growth of passenger transportation is also impacting air cargo as tourists often purchase from the home country of production and self-ship in baggage. IATA projects that passengers’ numbers will double to over six billion annual passenger journeys by 2027, so the trend of “buy & carry” will continue to impact air cargo.