EASA and United Kingdom

An applicant for an ATPL must already hold a CPL, a multi-engine instrument rating, and a multi-crew cooperation certificate.^[2] Alternatively, in EASA states and the United Kingdom, the applicant may only hold a Multi-Pilot Licence (MPL). ATPL holders who previously held an MPL are restricted to multi-pilot operations unless they complete a CPL skill test and other requirements.^{[4]: FCL.505.A}

For aeroplanes, the applicant must have 1500 hours as a pilot of airplanes, including 500 hours in multi-pilot operations on airplanes, and a minimum number of hours as pilot in command (PIC) and/or pilot in command under supervision (PICUS). Time as pilot of helicopters, sailplanes and touring motor gliders may be partially cross-credited.^{[2][4]: FCL.510.A} For helicopters, the applicant must have 1000 hours as a pilot of helicopters, as well as other hour requirements. Time as a pilot of aeroplanes may be cross-credited up to 50%.^{[4]: FCL.510.H}

The applicant must pass a skill test, demonstrating their ability to perform procedures and manoeuvres, as PIC of a multi-pilot airplane under IFR. The applicant must hold a type rating for the aircraft used in the skill test.^{[4]: FCL.505} The skill test may be carried out in a suitably qualified full flight simulator.^{[4]: FCL.520.A}

The minimum age to gain an ATPL is 21 years,^{[4]: FCL.500} and holders must have a Class 1 medical certificate. There are separate ATPL licences for aeroplanes and helicopters.^[2][5]

From the age of 60-64, pilots may only act as part of a multi-pilot crew in commercial air transport operations, however they may continue to act as Pilot In Command. From the age of 65, they may no longer act as a pilot in commercial air transport operations (from age 70 for balloons and sailplanes).^{[4]: FCL.065}

United States

After the crash of Colgan Air Flight 3407, an air transport certificate became a requirement for all commercial air transport pilots. This effectively raised the number of flight hours required for new commercial pilots from 250 to 1500. Applicants with military or university flying training can apply for a restricted airline transport pilot certificate (R-ATP) with a reduced number of hours. The R-ATP can be obtained at age 21.^[9][10][11]

To be eligible to take the Federal Aviation Administration's (FAA) ATP practical test, the candidate must have at least 1500 hours of experience in aircraft, including 250 hours as a pilot-in-command (PIC), and be at least 23-years-old.^[12] Restricted Licenses (which allow the holder to perform only second-in-command duties) may be granted to individuals that meet one of the following criteria:

• Military pilots who are 21 years or older with 750 hours total time.
• Graduates with a four-year degree in aviation from certain approved universities, that have 1000 hours of total flight time and are 21 years or older.^[13]
• Graduates with a two-year degree in aviation, who have 1250 hours and are 21 years or older.
• Pilots with 1500 hours who are 21 years or older.

The pilot can remove the restriction once they have achieved the normal prerequisites.^[14]

The FAA ATP flight test can be taken in a light piston aircraft with 1,500 hours of experience, however, the FAA additionally requires a 'Type Rating' to pilot any large or jet-powered aircraft. Most FAA-certified pilots earn their ATP certificate and Type Rating (aircraft specific) simultaneously via the successful completion of a part 121 airline training program and type rating check-ride.

While pilot certificates in the United States do not expire, there is the additional requirement to have a valid Airman Medical Certificate of appropriate level with regards to the type of flight being conducted. To exercise the privileges of Airline Transport Pilot, one must also possess a current, and valid First Class medical, which is only valid for a period six months. In order to continue to exercise the same flight privileges, the pilot must go through the same medical examination to be recertified with a First Class medical. First Class medicals are the most stringent, and require that airmen be in good physical and mental condition. Blood pressure and other common health aspects must be within a fairly strict range to continue to qualify.

With very few exceptions, most other types of commercial pilot operations require a Second Class medical, which has slightly less stringent requirements and is valid for one year.

In addition to the medical recertifications, pilots also undergo periodic flight reviews to ensure they are safe to operate aircraft. While these proficiency checks do not affect the duration of the validity of the actual pilot license, they are still required to be in full compliance with the law.

So while pilot certificates in the United States do not expire, they are only one half of the requirements that permit one to act as a pilot. Periodic medical recertifications and flight proficiency reviews ensure pilots remain safe as they age.