Ralph traveled often on business trips. Depending on where he was flying, he used one of two preferred airline companies. When he flew with one company, he never had problems with his checked baggage. When Ralph flew with the other company, his luggage was often lost and it took at least one day to receive it. Explain.
1. He always checked at least one bag, with either of the airlines. 2. Ralph was unaware of what other customers were doing around him.