As an expert builder using the grace that God gave me, I laid the foundation, and someone else is building on it. But each person must be careful how he builds on it. According to the grace of God given to me, like a skilled master-builder I laid a foundation, but someone else builds on it.
The most-advanced helicopters can fly up to 300 miles before having to refuel. How long any particular helicopter can fly without refueling depends on the size, weight and age of the helicopter.
A very intriguingly intelligent question. The average cruising altitude for long haul flights ranges from 30,000 to 40,000 feet depending on the capability of the aircraft. Aircrafts are cleared to specified heights on each leg of their journey. The ATC will not clear a pilot to fly at 30,000 feet if Mt. Everest is in its route. They will either detour or climb higher.