Air carriers are replacing older, bulky seats with slimline models. The airlines will be able squeeze even more seats on a plane. But the airlines say passengers shouldn't notice the difference between the new and old seats. Recaro, that manufactures slimline seats says,” Even in high density seating, passengers have more living space thanks to the SL3510, as the netting material makes the backrest much slimmer, increasing the distance between seat rows.” The air carriers add the new seating gives something passengers want -- power plugs keep their electronic devices going on those long flights.