American Airlines Group Inc (NASDAQ:AAL) shares are trading lower in Tuesday’s after-hours session after the company announced the departure of its executive vice president and lowered guidance for the second quarter. What Happened: After the market close on Tuesday, American Airlines said Executive Vice President and Chief Commercial Officer Vasu Raja will depart the company in June. Stephen Johnson, vice chair and chief strategy officer, will assume leadership of the commercial organization, effective immediately, and help lead the search for a new chief commercial officer in addition to his…