Final answer:
The maximum altitude with the landing gear extended depends on the specific aircraft and is generally not a limitation. The landing gear is typically retracted once the aircraft has reached a safe altitude for better fuel efficiency.
Step-by-step explanation:
The maximum altitude with the landing gear extended depends on the specific aircraft. In general, the landing gear is designed to be extended during takeoff and landing, so it does not have a significant impact on the maximum altitude the aircraft can reach.
For example, the F16 aircraft mentioned in the information can reach altitudes of over 15,000 meters (49,000 feet) with the landing gear extended.
However, it's important to note that the landing gear is typically retracted once the aircraft has reached a safe altitude, as it contributes to air drag and reduces fuel efficiency.