My MacBook kicks me off of airline website when checking specific flights. It returns me to airline homepage. Also, it has been kicking me off of my own homepage. These problems appear to have started after downloading recent Apple Updates.

To fly on both Delta and Alaska Airlines, you will generally need a valid government-issued identification (ID) to board your flight. This can be a driver's license, passport, or another form of government-issued ID. It is important to note that different countries and airlines may have different requirements for acceptable forms of ID, so it is best to check with the specific airline and the country you will be traveling to for their specific ID requirements.
In general, it is a good idea to have a valid government-issued ID with you when traveling, as it may be required for a variety of purposes, such as checking in for your flight, passing through security, or verifying your identity while traveling. It is recommended to bring a passport if you are traveling internationally, as it is a widely accepted form of identification and also serves as proof of citizenship.
If you are unsure about the ID requirements for your specific travel plans, it is recommended to contact the airlines or check their websites for more information.

You go to the website for that airline and enter the confirmation or reservation number and you should see the option to print it. If you don't see that option, it means you have to check in at the ticket counter at the airline desk.