A travel/flight ban changes the exponent, which changes the shape and peak of the healthcare curve, buys time for gathering data, and in Omicron's case, more ti

A travel/flight ban changes the exponent, which changes the shape and peak of the healthcare curve, buys time for gathering data, and in Omicron's case, more time to roll out an mRNA booster dose which significantly improves protection against severe symptoms compared with the 2-dose schedule. It definitely has an effect, even if the virus is not "stopped".