His racing career lasted from 1988 until 2005, and, in addition to the 24 Hours of Le Mans, the BTCC and DTM, saw him enter the International Formula 3000, the French Supertouring Championship (CFS), the Italian Super Touring Championship (ISTC), and the Super Tourenwagen Cup (STW), in addition to several other series.

[6] In 1993, Aïello switched to touring car racing in the French Supertouring Championship (CFS), finishing runner up, whilst driving for the non-works team Oreca.

[7] After a less-successful 1995 season, where he finished third overall, and won just one race, he made the switch to the Super Tourenwagen Cup (STW) in Germany for 1996, still driving for Peugeot, but in their new 406 model, following their withdrawal from the CFS.

[11] For 1999, Aïello switched to the British Touring Car Championship (BTCC), driving for the works Nissan team in their Primera model, replacing the outgoing Anthony Reid, who had moved to Ford.

[20] The first season was unsuccessful, with no victories, as the Audi TT proved to be uncompetitive against the faster Mercedes-Benz CLK and Opel Astra rivals, its best finish being Aïello's fifth place at the second Oschersleben sprint race.

[22] Following heavy development on the car, 2001 would prove to be more successful: Aïello was the first member of the Abt team to win in the series, at the Nürburgring sprint race.

[25] 2002 would be an even more successful year — Aïello defeated reigning champion Bernd Schneider to take the title by six points,[26] winning 12 races in the process.