Table 11.

Literature on future challenges in the face of COVID-19.

Study	Major finding
Bauer et al. (2020)	Ultra long haul operations can give a competitive advantage in terms of health facing COVID-19.
Chen et al. (2020b)	The possibility of implementing “immunity certificate/passport/license” for safe re-opening of travel was discussed.
Hendrickson and Rilett (2020)	Uncertain long-term impacts of COVID-19 were discussed, such as stay-at-home telecommunication vs. personal travel, and crowd-reduction in transportation systems.
Macilree and Duval (2020)	Several aero-political issues impacting the aviation section post-COVID-19 were reviewed, covering the role of ICAO, airline bailouts, and ownership.
Suau-Sanchez et al. (2020)	Based on a survey with 16 senior aviation executives, structural changes of the aviation industry due to COVID-19 incorporating supply, demand, regulation and business ethics, were investigated.
Tardivo et al. (2020)	The impact of COVID-19 on transport sector was analyzed. The establishment of rail as the backbone of the European sustainable mobility is recommended.
Wilson and Chen (2020)	Preparation of reopening should incorporate the risk assessment of COVID-19, such as traveller's personal risk stratification, trip-based determinants, and policies including health in-assurance.