126 LEGAL IMPACTS OF COVID-19 IN THE TOURISM INDUSTRY e) Even if there is no legal suspension to the rule, airline carriers can allege changing of circumstances (rebus sic standibus clause) to temporarily and unilaterally change the contracts made with airports, as the slot allocation is contractual. REFERENCES GREMMINGER, Michael (2006), Commercial Slot Allocation - A Competition policy perspective. HAYLEN, Andrew & BUTCHER, Louise (2017), Airport slots, Commons Library, Briefing Paper number CBP 488. IATA Worldwide Airport Slots - Fact Sheet (May 2019). PHEASANT, John & GILES, Matthew, Slot trading in the EU, Global Competition Review, consulted at https://www.hoganlovells.com/~/media/h ogan-lovells/pdf/publication/slottradingjpheasantmgiles_pdf.pdf. CORDEIRO, A. Menezes (1987), Da alteração das circunstâncias, Separata dos Estudos em Memória do Prof. Doutor Paulo Cunha, Lisboa.
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