The father looked as if he might have once been a marine himself, a handsome man of perfect posture, with bristly silver hair, dressed smartly in a blue blazer and gray slacks. The mother, blond, wore light-colored pants and an orange jacket. Her glasses made her eyes seem bigger than they were. They both looked calm, if a little lost, and gave off an aura of deep quiet. As she walked by me she noticed that a tie had fallen as I was removing something from my carry-on bag and she stopped and pointed. “I think you dropped something,” she said softly.

They stood at the window between Gates 43 and 45 and watched as a full Marine honor guard marched up the tarmac, coming to attention between the plane and a silver military hearse. The unloading of their son’s coffin from the cargo hold was very slow, and every time someone inside the terminal noticed and stopped to stare, someone else noticed and did the same, and this kept happening until about 20 people stood in silence watching out the window.

The mom leaned her elbows on the window ledge, supporting her chin and cheeks with both hands. She remained perfectly still. She stared for 10 or 15 long minutes and never moved. The father stood nearby, rocking from foot to foot and pacing a bit. They did not touch; they did not say a word to each other. Neither wore a wedding band. Perhaps they were divorced, or simply isolated in their pain.

Standing nearby was a man wearing the T-shirt of a suburban fire and rescue department that he may have earned 20 years and 35 pounds ago. He went over to the parents to chat, not knowing who they were, just one curious spectator to another.

But whatever he said to the mother caused her to turn and look at him in disbelief. Her lips didn’t move, which only encouraged him to repeat it. Her eyes widened and her chin tilted upward like a boxer who had taken a blow. She stared at him and then looked back outside toward her son. Down on the tarmac the white gloves of eight marines snapped their final salute as the doors of the hearse closed.

The P.A. system announced flights for Atlanta and Chicago. Travelers rushed to business meetings or summer vacations. The line for Auntie Anne’s pretzels was as long as ever.

Except for a handful of us standing frozen at a respectful distance from the window, the war and its carnage might as well have been on another planet. The disconnect between those who serve and those of us who are beneficiaries of their service has always felt great to me, but never greater than at that moment.

The mom and dad stepped away from the man in the T-shirt and to another window, still not touching, their movement synchronized by grief. They waited until the marine in charge came back up from the runway to escort them to a government vehicle. I went to my car and drove to work with no ambition for the day other than to be worthy.