While you may be able to book your airline ticket without your passport number, you must have a valid passport in hand before you arrive at the airport. If you don't have a valid passport, you will not be permitted to board your flight.
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You could have problems checking in and getting through security. Make sure that the name matches exactly because the worse thing is to be denied boarding. If it is an error on the part of the airline make sure you get it corrected before you fly.
This is absolutely normal. A passport is not required to purchase a ticket and you may be doing it for someone else or someone else could be doing it for you, so only need the full name of passenger is needed. This makes the process of buying quicker.
The verification, the airline says, happens by scanning the photo page and reading the embedded passport chip. The digital identity is then created, stored on the mobile device and ready to use for future travel.
Yes, simply show your mobile boarding pass on a mobile phone, iPad, or Apple Watch and a valid form of identification to the TSA Agent at security to proceed.
In the event you arrive at the airport without proper ID, because it is lost or at home, you may still be allowed to fly. By providing additional information, TSA has other ways to confirm your identity, like using publicly available databases, so you can reach your flight.
You can go to the Airline's website to “manage my reservation”, and update your passport information there. If you have a problem you can call the airline, or contact them through social media.
At immigration (if they have it) they need to check if you overstayed, record your departure, and stamp you out (potentially). At the gate, they're double checking that you're you, matching it to your ticket, and again, ensuring that your passport is valid etc.
Reasons Passengers Can Be Denied BoardingThere's a few simple reasons why you may be denied boarding by an airline. The typical ones that come to mind are if you don't make the check-in deadline or don't have the right identification.
An Airline is entitled to do whatever it wants. Its mandates are published in a charter, on public display, but broadly, yes, they can withhold a boarding pass for any reason. They want their passengers to be happy, and so they generally won't deny you boarding, but there are many reasons for denying a boarding pass.