Many of us have learned the ins and outs of air travel in great detail and mastered the frequent-flier game in recent years, but two incidents this month reminded me that we often take for granted some basics that are unknown to many travelers.

Did you know, for example, that there are still people who have no idea they can check in for a flight online, even though they fly at least once a year? Or that some passengers miss their international flights because they are not aware they need to be at the airport by a certain time? Last week, I was stuck at the Minneapolis airport for hours because of bad weather. The airline I was flying had shut down its business lounge there, so there would be no peace and quiet or free soft drinks and snacks for me…