Ed Galkin traces his fascination with aviation to watching planes taking off and landing in Newark as a young boy. “I always wanted to fly. Always,” said Galkin, 86, of Edison. Now, he’s getting ready for his fourth, and likely final, flight around the world starting Sunday, with a co-captain 22 years younger joining him at the controls. “This probably will be my last circumnavigation,” said Galkin, who was joined by other co-pilots for his three prior journeys around the Earth in 1988, 2004 and 2018. There is a poignant undertone to their journey. As he did in 2018, Galkin is using his worldw…