“I’d like to switch seats, please.”

My grandmother said it so softly that I almost thought I had misunderstood her. We were standing at the gate counter at Boston Logan. She held her boarding pass in one hand and pressed her worn brown leather purse against her chest with the other.

The gate agent checked the ticket, then looked at Grandma, then at me.

“Ma’am, you’re currently in first class. Seat 3A.”

“I know,” Grandma replied. “But I’d like 34A instead, if it’s available.”

“It is available. But if you voluntarily move to economy, we can’t refund the fare difference.”

“That’s perfectly fine.”

I stepped forward. “Grandma, what are you doing? That ticket cost me more than I want to think about.”

“I know, sweetheart,” she reached for my hand. Her fingers felt cold. “I’d rather sit in the back.”

My grandmother, Ruth Walsh, had just turned eighty. She lived alone in Dorchester, planted flowers every spring, and did crossword puzzles in ink. I’m Sam, a twenty-seven-year-old nurse at Mass General. I had spent nearly a year saving extra shift money to buy her a first-class ticket to San Francisco for her 80th birthday.

She hadn’t flown in twenty-seven years—not since March 14, 1999, the day after I was born, when my grandfather Frank Walsh passed away. Yet she specifically requested Flight 212 on March 14th.

I had booked us both in first class—3A and 3B—so she could be comfortable. But at the gate, she insisted on trading 3A for 34A in economy, forcing me to keep my seat in first class alone while she walked back with her wooden cane.

About two hours after takeoff, I walked back to economy to check on her.

Row 34 was by the window. Grandma was holding her purse tightly against her chest. Beside her sat an eight-year-old boy wearing an “UNACCOMPANIED MINOR” badge named Oliver, who was bouncing his knee nervously.

“You okay, Grandma?” I crouched beside them.

“I’m fine,” she said, but her hands were trembling and her eyes looked damp.

“I’m nervous too,” the little boy admitted quietly. “I don’t like when the airplane shakes.”

“Neither do I,” Grandma told him gently. “But my husband used to repair airplanes. He taught me that turbulence is like driving over bumps in a road. The airplane is built to handle them.”

She smiled at Oliver, then looked at me. “I’m okay now, Sam. Go enjoy your seat. I have company.”

I returned to my seat in first class. But twenty minutes later, I saw one of the pilots exit the cockpit and walk slowly down the aisle toward the back of the plane, searching every row until he stopped right at row 34.