Is this a tribute to Red Arrows engineer?

Gemma Coultas spotted these trails in the sky over Bridlington Harbour this morning.
Photo by Gemma CoultasPhoto by Gemma Coultas
Photo by Gemma Coultas

She said: “I saw some letters in the sky this morning and wondered if it was a tribute. Looks like CL66.

“Customers are saying it could be a tribute to the Red Arrows engineer who died yesterday - either his squadron number or the plane.

“I could see four aircraft. They stayed a while circling and left - silently.”