Well... It depends how many seats the manufacturer decided to install.
On a standard 747 jumbo jet, there are 420 seats.
Depends on how the airline has it configured, but 60-70 seats.
it depends on what kind of jet it is. 737 jet: 200 747 jet: 500 757 jet: 280 767 jet: 290 777 jet: 550 787 jet: 350
On a standard jumbo jet (747), there is 420 seats. On a A330-200 I believe there is somewhere around 250 seats.
The Embraer ERJ145 seats 50 passengers.
It depends on which aircraft you mean: some are single seaters, some are two seaters.
It is the Embraer ERJ-145 XR. Operated by Expressjet ( Continental express, United Express)
One typically does not book a seat on a private jet flight, rather one would charter a jet. Online sites that one can charter a jet include One Sky, Blue Star Jets, Private Jet Charter, and Luxury Air Jets.
The simplest place to do so is through the easy jet website, but easy jet tickets can also be purchased at the airport if there are open seats available for purchase.
The Embraer E-195 can be configured for 106 seats in a 2 class layout, up to 122 seats in a single class layout
I don't think so because Jet skis seats are bigger and as your riding you have water spraying in your face