since the final FIA Sportscar Championship and FIA GT Championship series used similar cars, but different rules which would require teams to modify their cars or buy new cars to comply with ELMS rules. For the ELMS events that included ALMS teams, very few teams actually bothered to make the trip across the Atlantic to participate in races that appeared to have very few serious competitors. Thus the entry lists for each race fell from 25 at the beginning of the season to a mere 14 at season's end, with some classes only having one or two competitors. With a lack of involvement from teams, and less interest from the media due to the lack of teams, the European Le Mans Series folded following the 2001 season. The ACO was not completely satisfied with the fact that IMSA did not fully comply with the ACO's regulations in order to help attract privateer teams, as well as the failure of the FIA Sportscar Championship to succeed in Europe. Seeing the success of the American Le Mans Series, the ACO decided that a series run by themselves would be a better alternative for Europe. The ACO would instead attempt to attract factory backed teams with longer endurance races than ALMS and FIA SCC ran. The series would also be European based instead of international, thus it could be closer to the factories of many sportscar teams to help attract them to the series. In 2003, the ACO announced their intentions to create their own European-based series, named the Le Mans Endurance Series, which would be similar to the original European Le Mans Series, but feature only 1000 km races instead of the shorter, 2 hour 45 minute races used by the ELMS, and fewer races in a season than the ALMS and FIA SCC to help keep costs down. Winners of the LMES championship would go on to earn automatic entries in the 24 Hours of Le Mans, similar to the American Le Mans Series. The series was initially previewed in an open race run under the LMES banner in 2003 at the 1000km of Le Mans, a one-off event before the season started in 2004. For the 2004 Le Mans Endurance Series, the series participated in four events, including resurrecting classic races like the 1000km Monza, 1000km Nürburgring, 1000 km Silverstone and the Spa 1000 km. Many competitors participated, making the