By Bret Kenwell Boeing stock has been rallying nicely over the past month — and the rally may not be done just yet. Boeing (BA) – Get The Boeing Company Report stock has not had an easy year. To be fair, not many stocks have. But some investors may be surprised by the underperformance of the airline and aerospace stocks. Travel trends are booming despite high inflation and higher travel costs. We’re seeing packed airports and airlines operating at their highest level in years. Nonetheless, stocks like Delta Air Lines (DAL) – Get Delta Air Lines Inc. Report, United Airlines (UAL) – Get United …