
https://www.iod.com/Portals/0/PDFs/Campaigns%20and%20Reports/Europe%20and%20trade/Going-global.pdf?ver=2018-04-04-164140-840

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/695321/An_inspection_of_exit_checks.pdf

http://www.iata.org/publications/economic-briefings/value-of-air-cargo-2016-summary.pdf