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Whenever scientists create a vaccine for COVID-19, governments worldwide will be [scamming / scrambling] for cargo aircraft. Distributing the vaccine will be one of the biggest [logistical / logic] operations ever. Aviation [expats / experts] have forecast that transporting the vaccine across the [global / globe] will require around 8,000 747 [freight / fright] planes. This is sufficient to ship 7.8 billion doses of any vaccine - one [dose / hose] for everyone on Earth. The International Air Transport Association (IATA) has [waned / warned] governments they must start planning for the "mission of the [centurion / century] ". It said: "Even if we assume that half the [needy / needed] vaccines can be transported by land, the air cargo industry will still face its largest single transport challenge [never / ever] ."

IATA has warned governments that many [obstacles / tentacles] must be overcome [by / to] ensure the effective distribution of a vaccine. One critical element of [there / this] is the creation of temperature-controlled cargo hubs and warehouses. It is [essential / essence] the vaccine be kept at the same temperature throughout [its / one's] journey. This would require extensive training of staff worldwide, who must [quickly / quick] become expert in safely handling and [movement / moving] the vaccine. IATA said a further challenge would be [security / allergy] and cross-border controls. It said: "Vaccines will be [highly / height] valuable commodities. Arrangements must be in place to ensure that shipments remain secure [from / to] tampering and theft."