One issue that those traveling from North America should consider, when buying their tickets, is related to connecting flights. In some cases the flights aren't considered as contiguous (adjoining) in their issue.
That means that there is "no guarantee" on the next flight, or leg, if you prefer. If you miss it, there is no recourse for a different flight. You end up paying for the flight you didn't make, and end up paying for a different flight.
This can happen when you buy your tickets through sources that are offering "best buy" services, and unless you get the guarantee for each leg of your flight... be cautious.
Though it hasn't happened to me, it did to a family of four that I know of, that was destined for Spain. Their airline links were from San Antonio to NYC, to London, and then to Madrid. Their plane arrived too late in NYC for the second flight, and they ended up losing all four tickets for the next two legs, because the airline bookings were not considered part of a "continued flight package."
Sometimes... what appears as a great deal... isn't what you thought
This may sound like a rare situation but if it ends up happening...
Wolf