I’ve seen enough in my ten trips to Africa that I take the following approach: never, ever, ever change carriers. This is a painful personal policy, it means over land 8-12 hour truck rides. It means going around the world the wrong way. (E.g 49 hours to Zimbabwe) The positive is, if you clear TSA and you clear your airline and watch it get on the plane, it’s probably going to arrive. It’s changing carriers or changing planes or changing foreign to domestic routes that invite people to make decisions without you present to discuss or debate the misinterpretation.
As to bribes, I don’t recommend bribing any foreigner. You know what bribes are kosher and not kosher in your land. Twenty years ago, donating to the police fraternity would get you out of a ticket without it looking too sketchy. Bribing a building inspector or a tax agent will potentially go very very wrong. No one knows these nuances in a foreign land. If your PH says “thank you” and hands a $10-20 unwarranted gratuity, he knows the nuance of the moment. Foreigners start throwing around Benjamin’s and you could end up in a foreign prison if you guess wrong, what’s better for the crook, $100, or a major bust getting them a promotion? F around and find out.
lastly, bribes are just stupid. Paying someone off, a crime, when you’ve committed no crime, just makes you a criminal. It also sets a custom they expect in the future from everyone more often. Let locals in your employ decide when a can of soda, or a gift is appropriate.