1. Flying with gear
There are so many variables to consider when you plan to fly for a shoot. My nerves are always going as I worry I will leave something behind. But there are ways to help calm those nerves and feel prepared. I would first recommend that you make a list of essentials – camera body, two or three lenses, two batteries, back up charger for batteries, and at least two memory cards. These are just the essentials! Depending on what kind of trip/job/traveling you are doing, there may be some additional items you wish to bring. But, these are a MUST for me!
I like to use a solid camera backpack that carries all of those things, so they are on my back and with me at all times. You do not want to check-in your camera gear.
If traveling overseas, check to see the weight limit of carry on bags. It is a terrible feeling when they are asking you to gate check your most valuable items. Also, some places like to see proof of ownership/purchase of the gear you have. I was coming back from Mexico and they wanted to tax me for what was in my bag because they questioned if I purchased any of it while visiting Mexico. From that experience, I learned its better to be safe and prepared for anything like that. You are not always aware of laws in different countries. I keep a little pouch in my camera bag with proof of purchase or warranties so I can prove that it is in fact my gear, not a new purchase!
When traveling, the big question of what gear to bring is very hard. To me, my first question is, “how much am I gonna be on foot?” You have to think of weight on your back, as well as what lenses will provide the most coverage and help you in the majority of situations. With those two questions in mind, I love to bring my 24-70mm lens and my wide 28mm lens. If i plan to photograph a lot of food while visiting somewhere I also bring my 50m lens. This also acts as a wonderful portrait lens. With those three lenses, I feel pretty solid.
If you have a place thats safe to leave gear, once you arrive to where you are going, an extra camera bag with more lenses and an extra body is always recommended. An example of that is shooting a destination wedding. You need external flashes, more memory cards, 70-200mm lens. Again, you can usually have two cary-on bags. So, you still can keep gear on you. Split up the weight so you feel comfortable while traveling via airport.