Cost

Costs 80,000 gp to buy downright plus 10 gp per 5 square feet on the deck. So if it is a 80x20 ship it would cost 10(80x20)+80,000, which is 96,000 gp.

Engine

The engine is a separate piece. Look here for the Airship Engine.

Fuel Costs

Fuel costs are quite expensive if you happen to carry a lot of supplies, or have lots of animals. It costs 2 gp per passenger (including the captain) per lift, and it costs 1 gp for every 100 pounds of stuff you are carrying (including mounts). If a player has a certain thing the captain wants, the captain can lower the price for that travel if they wish.

Construction

It takes 129 days for the Airship to be constructed, and 286 days for the engine to be made.

Carrying Weight

This depends of your ship size. If it is 80x20 like my last example, it would be 80 times 20 times 10, or 16,000. This is 8 tons.

Stats

STR 14 (+2)
DEX 14 (+2)
CON 12 (+1)

Damage Immunities: poison, psychic

Condition Immunities: blinded, charmed, deafened, exhaustion, frightened, incapacitated, paralyzed, petrified, poisoned, prone, stunned, unconscious

Hull

Armor Class: 13
Hit Points: 300

Control Helm

Armor Class: 16
Hit Points: 50
can move up to the speed of its engine, with one 90-degree turn. If the helm is destroyed, the airship can’t turn.

Engine

Armor Class: 18
Hit Points: 100 - 20 ft. speed per 25 damage taken

Locomotion (air) elemental power: speed 80 ft. If the engine is destroyed, the ship immediately crashes.

Weapons: Ballistas (4)
Armor Class: 15
Hit Points: 50 each
Ranged Weapon Attack: +6 to hit, range 120/480 ft., one target.

Hit: 16 (3d10) piercing damage.

Actions:
On its turn, the airship can use its helm to move using its engine.
It can also fire its ballistas | If it has half its crew or fewer, it can fire only two of the ballistas.

Notes: person with great leadership