The Summer Advantage Card from Northern Jet offers discounted rates during June, July, and August and two years of usage. Northern Jet, which built its business on flyers transiting between the upper Midwest and Florida, is offering a discounted jet car. Its Summer Advantage Card offers light-jet pricing at $6,635 per hour. Midsize jets are $8,635 per hour. Super-midsize aircraft are $10,635 per h...