The Truth About Cars site, points out Ford's silent leadership with Air Suspension technology. The high tech systems that apear in high end European cars, including Ford's PAG Range Rover and Jaguar, were around in Ford/Lincoln/Mercury products for the last 20 years.
Even the Crown Victoria has been available with air suspension for many years.
I had a 92 Crown Vic with the air suspension, and the ride was outstanding.
They don't mention problems Ford had with early systems, leaking bags. But I never had a problem with mine. This article makes me miss my Crown Vic.