As electronic entry procedures usher arriving passengers more quickly through immigration control at airports around the world, one of the casualties of progress is the time-honored passport stamp. While many travelers welcome the improved efficiency, those who regard passport stamps as souvenirs of their travels are going to miss the memories that an immigration stamp can trigger of the far-off destinations they have visited. "There is a trend to eliminate the passport stamp to shorten processing times, especially in advanced countries," a Japanese airport official said. With air travel growing, airports are looking for ways to prevent congestion, and ditching the tradition is one of the solutions. In Japan, this has seen the use of biometric identification, including facial recognition, emerge as a way to replace passport stamping to track people entering and leaving the country.