MIssing Foot Traffic Data for Certain POIs

I am currently downloading the Advan Research data for 2022–2024 and have noticed that many major airports, such as Cleveland Hopkins International Airport and John Glenn Columbus International Airport, lack the data of visits and visitors from home CBGs for the period between December 2022 and December 2024. I would like to inquire about the reason for this missing data. Could you provide any insights into this issue? Thank you very much for your assistance.