AB reviewer#1

 Seats on public, sometimes are offered thru travel agencies in promotional tours, utilizing the chartered flights inclusive of the tour package

• They operate between points within a specific area of the country.

•  are subdivided as large, medium or small depending on gross revenue and whether they hold a certificate of public convenience.

Also called trunk airlines, or full-service carriers, focus on long-distance or long-haul routes.

Provide air service between smaller cities and also connect these small communities with major airports

 

• Offer regularly timed flights over prescribed routes and published timetables

 Also known as "no frills" airlines that cater to passengers wanting cheap airfares with little demand for inflight services.

are certificated carriers with annual gross revenues between $10 million and $99 million.

No set flight schedules as it operates for the exclusive usage of passengers who requested the service based on demand. 

don't have a set revenue definition but are usually referred to as "commuter airlines" and they are non-certificated (no aircraft operators' certificate or AOC).

 are airlines using aircraft seating less than 60 passengers. Operate shuttle services between smaller airports that cannot support the major airlines and equipment.