Bob Kupbens, former vice president of marketing and digital commerce at Delta Air Lines, has joined Apple. According to his LinkedIn page, Kupbens’ title is VP, Apple Online Retail. Advertising Age noted the title was unconfirmed, but regardless, Kupbens looks to play a large role in Apple’s online retail efforts. The news comes during a time of change for Apple retail, as Angela Ahrendts will soon take over as the company’s new…