Skirmantas Strimaitis spent much of the two-hour flight taking selfies and reveling in the silence. (Courtesy of Skirmantas Strimaitis.) At a Glance Skirmantas Strimaitis was the only person booked on the flight. The Boeing 737-800 can carry up to 189 passengers.He called the experience "unique and surreal." Imagine a commercial airline flight where you don’t have to deal with chatty passengers, your neighbors poking their elbows into your ribs or the person in front of you reclining their seat. Sound...