The presidential suite onboard the Eastern & Oriental Express.Courtesy of BelmondMany train companies around the world, including in the US, offer first-class, luxury experiences.Some trains' first-class options include private cabins with en-suite bathrooms.On other trains, first-class travel means getting a cushier seat, more legroom, and free food.It's been a messy year for air travel, from increasing costs to headline-making airport headache…