Passengers check in for flights at Friendship Airport two days before Christmas in 1971. The busiest pre-Christmas time at the airport, according to past experience, are the two days preceding the holiday. Most of the additional planes are scheduled then and long queues form. Similar sights can be seen at Greyhound and Trailways stations and at Baltimore&#039;s Pennsylvania station as the season of goodwill brings some visitors with gifts to the city and takes others away. (Richard Childress/Baltimore Sun)