Parts

Question 1

Part 135

Answer 1

non scheduled operations
30 or fewer seats max payload of 7,500 its or less or rotorcraft
require air taxi registration

scheduled
no more than 4 weekly round trips between any 2 points pursuant to published schedule in aircraft 9 or fewer seats
require air taxi registration

private for hire - no dot authority required

commuter - requires CACA

Question 2

Part 121

Answer 2

supplemental operations in aircraft with pax greater than 30 seats exceeds 7,500 lbs requires CPCN or CACA

domestic or flag operations in turbojet aircraft requires CPCN or CACA

Question 3

Part 125

Answer 3

Private carriage for hire operations frequency of which is subject to the limits on the overall number of contracts that the operator may enter into.