Executive Charter Services says its new guaranteed charter rates are significantly lower than the comparable rates for fractional and jet-card aircraft. The Boston-based company guarantees a price of $2,300 per hour for light jets and $3,350 per hour for midsize jets, with a 2.5-hour minimum. These rates include federal taxes, segment fees, overnight charges and landing fees. According to ECS, 25 flight hours in light jets will cost $57,500, compared with a combined average of $71,250 at several frax and jet-card operators.