The traveling procedure is not confined only to booking because several ahead modes need to be accomplished. So, when you are traveling with TAP Portugal Air and willing to board the flight, then you may have to complete the check-in procedure.
Select online modes for check-in
When you are traveling to a destination that allows an electronic boarding pass, then conduct a check-in online. Thus the process related to that has been displayed at the bottom:-
Get to the Kiosk machine at the airport
When a route does not permit an e-boarding pass, then you can get a printed one from the kiosk at the airport.
When you have selected TAP Air Portugal as a travel companion, then you would have to complete the check-in procedure in the given time frame to have a boarding pass. So, when you conduct a check-in with the online modes, then you could do that at least 36 hours before departure time, but a flight to/from the U.S. could get a 24-hour window.
When you have to check in at TAP Air Portugal, then you get to accompany certain rules and regulations. Thus you can get that information from the Tap Portugal Check-in Policy, which is as:-
The check-in at TAP Air Portugal can be conducted at least 36 hours before the flight's scheduled departure. However, there is an exception for the routes of United Airlines because they can perform check-in at least 24 hours prior to departure time.
When you have a flight ticket with TAP Air Portugal, then your duration of check-in could be counted as flight tickets and destinations. Hence, you can have information about the same by going through the bottom.