https://boe.es/boe/dias/2019/11/05/pdfs/BOE-A-2019-15790.pdf#BOEn
https://www.brookings.edu/articles/the-alitos-flag-flying-and-the-limits-of-regulating-the-supreme-court/
http://ec.europa.eu/transport/sites/transport/files/eu_air_carriers_by_country_holding_an_active_operating_licence.pdf
https://visegradinsight.eu/whips-and-chains/?utm_source=VI+WWW&utm_campaign=03b4a33b7d-EMAIL_CAMPAIGN_4_19_2018_COPY_01&utm_medium=email&utm_term=0_3598053f62-03b4a33b7d-150926415