These are definitely correlated, but there is probably no common single factor other than COVID-19. Especially considering (I don't think) Indianapolis and Hong Kong have ever had a direct flight connection. So while each data set may be interesting on it's own, or grouped in a larger data set, the two, directly compared, don't really make sense together.
The most interesting thing about this graph, is that a large transportation hub like Hong Kong has basically barely recovered, in comparison to a smaller hub like Indianapolis. However, looking at the data provided before COVID-19, it looks like airport shutdowns in general cause major disruption and there could be a multitude of reasons why a place like Hong Kong may have (and continue to have) lower air travel traffic volumes, especially 2 years after an event like "protests".
brawler839 t1_j2cse54 wrote
Reply to [OC] Monthly Enplaned Passengers, Hong Kong International Airport and Indianapolis International Airport, 2019-2022 by thexylom
These are definitely correlated, but there is probably no common single factor other than COVID-19. Especially considering (I don't think) Indianapolis and Hong Kong have ever had a direct flight connection. So while each data set may be interesting on it's own, or grouped in a larger data set, the two, directly compared, don't really make sense together.
The most interesting thing about this graph, is that a large transportation hub like Hong Kong has basically barely recovered, in comparison to a smaller hub like Indianapolis. However, looking at the data provided before COVID-19, it looks like airport shutdowns in general cause major disruption and there could be a multitude of reasons why a place like Hong Kong may have (and continue to have) lower air travel traffic volumes, especially 2 years after an event like "protests".