How many aircraft and pilots can a part 135 cover? If you form an LLC for charter flights, can you hire an unlimited number of pilots to fly under the same part 135 certificate (assuming all are commercial pilots), or does each pilot and/or each aircraft (all aircraft owned by the LLC) need to have their own part 135 certificate?
There is no restriction on the number, type of aircraft, or pilots for a "Full 135 Operator."

There are 4 levels of 135 operators:


Single-Pilot Operator
Single Pilot-in-Command
Basic 135 Operator
Full 135 Operator *


Source: http://usac.com/faa/InstructionTwo.asp?Product=Full%20135%20Operator