The airlines make you check in to see how many people are on the flight out of those who already bought their tickets. At the check in they also weigh and take your checked luggage
No, but check with your airline.
Each airline has it's own rules anrequirements, so you'd need to contact the airline that you plan to fly on.
A person who is traveling to an international destination will check in with the airline they are flying with. When at the counter of their airline, they will get their luggage checked, and taken, and they will submit their ticket and identification.
You will probably need photo ID to get on the plane. Check with the airline.
The passenger reaches in the check in counter, then returns due to some immigration problem or something others is known as go show.
Probably. You do not need a pasport but you do need photographic identity. Check with the airline.
You need to check each airline's Web site, according to the flight departure and arrival to the query, then check flight prices, choose to purchase the cheapest flights
They will email you a receipt with a barcode that you use like a ticket. You use it to check your bags then go and get the boarding pass at the counter inside the airport on the day of travel. Most any online airline ticket sales will send them to you in this manner. You'll need to have a credit card and follow their directions.
You will never get it through customs. You need to declare it at the ticket counter and get a waver. It is best to check with the airline FIRST if you don't want it taken away. Your best bet is ship it FedEX
not legally but it may be a requirement of your airline, so you need to check with them
depends on the airline and where you are flying from. Some require nothing (BA within the UK) some need "something offical" and some need a passport. Several airlines don't allow kids to fly without their parents.
If the airline you are traveling on allows it? Check with the airline you will be traveling on.