Class of Admission: This corresponds to the visa type you used to enter America. In the below example, it is a B1 visa. Admit Until Date: This is the date when the passenger or user has to leave America. It is the expiry date of the status in the US and when they should depart ...
Therefore, I opted to take the i94port field as this was likely to be more accurate and render a larger final dataset of valid arrivals. I then joined this with the local_code field on the airport_codes dataset to provide an arrival state code for each of the records in the data set...