Using the criteria provided in the table below evaluate the intensity (low, medium or high) of the threat of new entry in the U.S. airline industry. Specify if there are any differences in the threat of new entry for different strategic groups in the US airline industry.

Threat of new entry is high when	(Pre Covid) Is this the case? Yes or No?	Comments (required)
The minimum efficient scale to compete in the industry is low	(yes/no)
Network effects are not present	(yes/no)

New entrants expect that incumbents will not/ cannot retaliate	(yes/no)