Aubameyang fired the Gunners ahead in the 50th minute, finishing off a counter-attack, running at the Newcastle defence and then blasting home a powerful left-foot drive at the near post.
Ten minutes later Bukayo Saka made it 2-0 with a confident slot home after good work down the left flank from youngster Emile Smith Rowe.
Aubameyang completed the comfortable victory after Cedric Soares got to the...