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Resumption of higher volumes of passenger air travel will be dependent on a number of factors, including foremost public health agency guidelines (driven by travel risk levels), governmental travel restrictions and requirements, passenger confidence, and air carrier and airport operational capacity.

A risk-based approach will enable transitioning between stages of restarting operations and adjusting the mitigation measures based on risk, while recognizing that reverting to previous stages may be necessary. The goal is to maximize consistency and to develop criteria for data reporting and the monitoring processes in support of evaluation and progression to the next stage(s). It is currently not feasible to provide any specificity of timing between these stages. At the time this document was published, most of commercial passenger aviation was in Stage 0 or Stage 1