McIntyre was in Eubank’s corner on Saturday night for his victory over Liam Smith, but the trainer was arrested after officers were called at 10:45am the following morning as he waited to board a flight back to the United States.
The 53-year-old attended Stockport Magistrates court on Monday and was remanded in custody, and is next due to appear at Manchester Crown Court on Monday October 9.
Greater Manchester Police said in a statement: “Officers were called to reports of a possible firearm being found in hold luggage by airport staff at Manchester Airport.
“After initial inspection by security staff, GMP officers attended, and the firearm was seized.
“Subsequently, a 53-year-old man was arrested for possession of a firearm and was taken to custody for further questioning.
“Brian McIntyre from the United States of America was charged with possession of a firearm and possession of ammunition for a firearm without a certificate.”
McIntyre is currently viewed as one of the top trainers in boxing, having overseen Terence Crawford’s rise to the top of the sport and then helped Eubank produce a career-best performance to beat Smith in Manchester on Saturday night.
Speaking earlier this summer about his decision to join up with McIntyre, Eubank said: “I don’t have to second guess anything that I’m hearing.
“That was a big thing for me. I don’t want to have to think about ‘is that really going to work, is that really what I should be doing?’ Yes, it is because this guy’s done it and it’s worked at the highest levels for many years. So I trust these guys.”