For example, within the airplane category, there are four classes of airplanes, such as:
Single-Engine Land.
Single-Engine Sea.
Multi-Engine Land.
Multi-Engine Sea.
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Weight class is based are assigned by APO130 based on the TFMS observed aircraft codes. There are 6 categories -- (A) Heavy, (B) B757, (C) Large Jet, (D) Large Commuter, (E) Medium, (F) Small.
• Class I airplanes, which typically are single reciprocating engine airplanes un- der 6,000 pounds. • Class II airplanes, which typically are multiple reciprocating engine, multiple turbine engine and single turbine engine airplanes under 6,000 pounds.
Flying first class can be an amazing experience, especially if you're traveling internationally. Along with premium treatment in the airport, you can expect better seats, better food and better service onboard. However, first class tickets can also be expensive.
So to your original question, a person who has a current type rated for required pilot flight crewmember duties on a Boeing 747 cannot perform the same duties on a Boeing 787, 737, etc. without being type rated on those aircraft as well.
According to the requirements specified in the FAA Type Certificate Data Sheet (pertinent excerpts shown below) the B737-800 requires a minimum flightcrew of 2 - a Pilot and Copilot.