Originally Posted By: unimogbert
18:1 glide ratio is a number that comes to mind for jets. I've flown sailplanes with a much worse glide ratio.

I looked up glide ratios of passenger jets in the past and was surprised at the variability of answers. The 12-16:1 range comes up most frequently, but also some references as low as 3-4:1 (especially when flown "heavy") and also as high as 28:1 for an MD-80 on one website. Wow, really, 28:1?!