You do not need id to check in at Southwest. You need a confirmation number and your name. You can get that by logging in to your account or by referring to the e-mail that Southwest sent you when you completed the booking. If you don't know how to do that you can check in by using a credit card at the airport.
If you are traveling internationally you will still need your passport. If you are traveling domestically, you will only need one valid form of identification – either your REAL ID or another acceptable alternative such as a passport, not both.
A passport is an acceptable form of identification and may be used in lieu of a REAL ID Drivers License or ID to board domestic flights and visit federal facilities.
Add your state-issued eligible driver's license or identification card to your phone's digital wallet. Present your ID at select TSA PreCheck® checkpoints by tapping your phone or linked device. Your photo will be take by the TSA reader at security to proceed to screening.
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 must have a valid passport to enter the UK. It should be valid for the whole of your stay. You may also need a visa, depending on which country you're from.
If you are traveling internationally you will still need your passport. If you are traveling domestically, you will only need one valid form of identification – either your REAL ID or another acceptable alternative such as a passport, not both.
For customers flying solely within the UK, including Northern Ireland, a passport is not required, but customers must produce valid/in-date photographic ID when travelling, such as a passport or driving licence (full or provisional), employment ID, military card, residency card, etc.
If you only have an expired passport, you can still bring it along for domestic travel within the United States, but you must convince TSA officers that you are who you say you are. However, if you're traveling internationally, you must have a valid passport.
Absolutely not. A passport must be physically presented. It's originality is checked at the immigration of destination countries as also the VISA stamps.