I think, and there are more that know more around here, that you'll find that it's important to figure how many trips you're talking about that are between the 500-1000 mile range. Up to about 5 or 600 miles I think the king-air and citation would be fine, beyond that you're talking real jet. 1000 miles isn't a short leg. Less than 1000 miles but greater than 500--how many of those we talking about? And just about anything can handle 4800 feet(depending on field elevation)
In a month of flying about 30-40 hours average our trips have been something like this:
500-1000-10hrs
500-600 -15 hrs
Less than 500-15 hrs