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Since this question is about emall all documents that you might need, here are some that you might need. But not always.

  • Passport, if you are flying to a different country. A national ID will do if your flight is domestic.
  • Printout of e ticket. You will need a printed one if you are flying to a different country since you will need to prove your exit date in the next country.
  • Printed boarding pass. If your airline allows you to print your boarding pass early, do it. When flying overseas, you will have to go through a document check. But checking-in process is done at this point. I personally don't do this because I collect airliner-printed boarding passes :D

  • Make sure you have Visa if the country you are going to has no visa-free or VOA agreement.

  • If you plan to work in the other country, employment letter and/or IDs. For conferences, tickets to the conference, etc. Basically, any document to prove your intention if you are going to that country for any reason other than tourist purposes.
  • Some airlines ask you to show the credit card used to book the airline. I never had to do this myself, but I have met other people who had to.
  • In some countries, you have to fill an entry card before entering the country, the immigration officer keeps half of it, and you have to bring the other half when you exit the country. When you leave the country, try to bring that other half. Airports usually have departure cards, so don't worry too much about them.
  • Blank paper, if you are going to Israel. Israel entry/exit seals are a reason to reject your entry to some countries.

Since this question is about em all documents that you might need, here are some that you might need. But not always.

  • Passport, if you are flying to a different country. A national ID will do if your flight is domestic.
  • Printout of e ticket. You will need a printed one if you are flying to a different country since you will need to prove your exit date in the next country.
  • Printed boarding pass. If your airline allows you to print your boarding pass early, do it. When flying overseas, you will have to go through a document check. But checking-in process is done at this point. I personally don't do this because I collect airliner-printed boarding passes :D

  • Make sure you have Visa if the country you are going to has no visa-free or VOA agreement.

  • If you plan to work in the other country, employment letter and/or IDs. For conferences, tickets to the conference, etc. Basically, any document to prove your intention if you are going to that country for any reason other than tourist purposes.
  • Some airlines ask you to show the credit card used to book the airline. I never had to do this myself, but I have met other people who had to.
  • In some countries, you have to fill an entry card before entering the country, the immigration officer keeps half of it, and you have to bring the other half when you exit the country. When you leave the country, try to bring that other half. Airports usually have departure cards, so don't worry too much about them.
  • Blank paper, if you are going to Israel. Israel entry/exit seals are a reason to reject your entry to some countries.

Since this question is about all documents that you might need, here are some that you might need. But not always.

  • Passport, if you are flying to a different country. A national ID will do if your flight is domestic.
  • Printout of e ticket. You will need a printed one if you are flying to a different country since you will need to prove your exit date in the next country.
  • Printed boarding pass. If your airline allows you to print your boarding pass early, do it. When flying overseas, you will have to go through a document check. But checking-in process is done at this point. I personally don't do this because I collect airliner-printed boarding passes :D

  • Make sure you have Visa if the country you are going to has no visa-free or VOA agreement.

  • If you plan to work in the other country, employment letter and/or IDs. For conferences, tickets to the conference, etc. Basically, any document to prove your intention if you are going to that country for any reason other than tourist purposes.
  • Some airlines ask you to show the credit card used to book the airline. I never had to do this myself, but I have met other people who had to.
  • In some countries, you have to fill an entry card before entering the country, the immigration officer keeps half of it, and you have to bring the other half when you exit the country. When you leave the country, try to bring that other half. Airports usually have departure cards, so don't worry too much about them.
  • Blank paper, if you are going to Israel. Israel entry/exit seals are a reason to reject your entry to some countries.
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source | link

Since this question is about em all documents that you might need, here are some that you might need. But not always.

  • Passport, if you are flying to a different country. A national ID will do if your flight is domestic.
  • Printout of e ticket. You will need a printed one if you are flying to a different country since you will need to prove your exit date in the next country.
  • Printed boarding pass. If your airline allows you to print your boarding pass early, do it. When flying overseas, you will have to go through a document check. But checking-in process is done at this point. I personally don't do this because I collect airliner-printed boarding passes :D

  • Make sure you have Visa if the country you are going to has no visa-free or VOA agreement.

  • If you plan to work in the other country, employment letter and/or IDs. For conferences, tickets to the conference, etc. Basically, any document to prove your intention if you are going to that country for any reason other than tourist purposes.
  • Some airlines ask you to show the credit card used to book the airline. I never had to do this myself, but I have met other people who had to.
  • In some countries, you have to fill an entry card before entering the country, the immigration officer keeps half of it, and you have to bring the other half when you exit the country. When you leave the country, try to bring that other half. Airports usually have departure cards, so don't worry too much about them.
  • Blank paper, if you are going to Israel. Israel entry/exit seals are a reason to reject your entry to some countries.