Question: What are the primary airports that present in Italy during the year 2004?
About the article "Italy", section "Infrastructure".

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The United States Federal Aviation Administration (FAA) has a system for categorizing public-use airports (along with heliports and other aviation bases) that is primarily based on the level of commercial passenger traffic through each facility.
It is used to determine if an airport is eligible for funding through the federal government's Airport Improvement Program (AIP).
Fewer than 20% of airports in the U.S. qualify for the program, though most that don't qualify are private-use-only airports.
At the bottom end are general aviation airports.
To qualify for the AIP, they must have at least 10 aircraft based there, but handle fewer than 2,500 scheduled passengers each year.
This means that most aircraft are small and are operated by individuals or other private entities, and little or no commercial airline traffic occurs.
Nearly three-quarters of AIP-funded airports are of this type.
Most of the remaining airfields that qualify for funding are commercial service airports, and are more dependent on regularly scheduled commercial airline traffic.
This is subcategorized into primary airports, which handle more than 10,000 passengers each year, and nonprimary airports, which handle between 2,500 and 10,000 passengers annually.
These categories account for over 15% of AIP-funded airports in the U.S. Primary airports are further subcategorized into: Nonhub primary – airports handling over 10,000 but less than 0.05% of the country's annual passenger boardings Small hub primary – airports with 0.05 to 0.25% of the country's annual passenger boardings Medium hub primary – airports handling 0.25 to 1% of the country's annual passenger boardings Large hub primary – airports handling over 1% of the country's annual passenger boardings A third major category contains reliever airports, which are essentially large general-aviation airports located in metropolitan areas that serve to offload small aircraft traffic from hub airports in the region.
These account for the remaining 10% of AIP-funded airports. 
The old ATO system divided airports into five classifications under two broad categories: international and domestic airports.
These two broad categories were further divided into the following airport types: Primary international airports are the primary international gateways into the Philippines.
Secondary international airports are airports that are capable of handling international flights but are not designated as primary international gateways.
These airports may or may not service actual international flights and may or may not have active customs and immigration facilities.
Trunkline airports or major commercial domestic airports are domestic airports in major cities around the Philippines that are capable of supporting large aircraft.
These are, in most cases, the only domestic airports with an instrument landing system.
Secondary airports or minor commercial domestic airports are domestic airports in smaller cities and municipalities usually capable of handling smaller propeller aircraft.
Some airports in this classification are capable of supporting jet aircraft.
However, these airports are only open from sunrise until sunset, usually requiring notification of airport authorities if nighttime landing is a necessity.
Feeder airports are domestic airports capable only of handling small propeller aircraft.
Many of these airports are small airstrips serving far-flung islands.  
The following airports make claims based on objective volume measures that are defined above: Hartsfield–Jackson Atlanta International Airport, Atlanta, Georgia, United States: Largest number of passengers annually (1998–present);  Most aircraft movements annually (1999–2000, 2005–present); In 2007, Hartsfield again set the world's record for most aircraft movements in one year with 994,346.
Hong Kong International Airport, Hong Kong Most cargo traffic by weight annually (2010-present).
Airports of London combined, London, United Kingdom Largest number of passengers annually in all city airports combined (2010).
London Heathrow Airport, United Kingdom Largest number of international passengers annually (2004–present).  
The new CAAP system revises the previous ATO system, while maintaining the current classification of airports into international and domestic airports.
The change was made pursuant to the Philippine Transport Strategic Study and the 1992 Civil Aviation Master Plan.
The new system rationalizes the system of airport classification, represented by the following types: International airports are airports capable of handling international flights.
Airports in this category include airports that currently have or have previously served international destinations.
There are currently ten airports in this category, including all primary international airports, most secondary international airports, and Puerto Princesa Airport and Kalibo Airport, both trunkline and secondary airports, respectively.
Principal airports or domestic airports are airports that only serve domestic destinations.
There are two types: *Class 1 principal airports are airports capable of serving jet aircraft with a capacity of at least 100 seats.
Most airports previously classified as trunkline airports, as well as some secondary airports, are placed in this category.
One former secondary international airports — the Bacolod-Silay Airport — is also in this category.
*Class 2 principal airports are airports capable of serving propeller aircraft with a capacity of at least 19 seats.
Loakan Airport in Baguio City, previously a trunkline airport, some secondary airports, and Godofredo P. Ramos Airport in Malay, Aklan; Camiguin Airport, Cuyo Airport and Sayak Airport in Del Carmen, Surigao del Norte (on Siargao Island), all feeder airports, are in this category.
Community airports are airports that are used primarily for general aviation.
Most feeder airports are in this category and only three airports: Cauayan Airport, Labo Airport in Ozamiz City and San Fernando Airport in La Union, all former secondary airports, have regular air service.
Some feeder airports previously classified in the old ATO system, such as Lucena Airport, are not covered by the new system.
Airports not owned by the national government which were not classified in the previous ATO system, such as El Nido Airport, remain unclassified under the present CAAP system.