That depends which one. There are mant types of Cessna and you would have to name a type for such an answer
7
12, or in a few versions,14 passengers.
The Cessna Citation X is a long range business jet that can carry up to 12 passengers. This does not include the flight crew. It is the fastest jet civilian in the world.
The Cessna 406 is a twin turboprop executive aircraft. It can carry 14 passengers and about 1,000 pounds of cargo or luggage.
Cessna C-150 can hold 1 passenger. Cessna C-172 can hold 3 passengers
2 crew, 12 passengers.
The Cessna 195 has 5 seats: one crew and four passengers.
The Cessna 208 Caravan, will carry up to 14 people.
Up to 4.
Helicopters carry from 1 - 90 passengers
Over here you can carry as many passengers as the car is designed to carry.
120 passengers