Which chart furnishes terminal data for IFR flight in congested areas?

The correct answer, IFR Area Charts, is specifically designed to provide detailed terminal data for IFR (Instrument Flight Rules) flight operations, particularly in congested areas. These charts focus on the airspace surrounding busy terminals, offering vital information like navigational aids, airways, and significant topographical features, which are crucial for pilots flying in and out of high-traffic locations.

IFR Area Charts also include relevant airspace class information and communication frequencies, which help pilots navigate safely through these dense environments. The detail and format of IFR Area Charts are tailored for quick reference while flying, ensuring that pilots can efficiently manage their flight paths in complex airspace.

In contrast, En Route High Altitude Charts are intended for use in high-altitude en route navigation, not specifically for terminal operations. TACs, or Terminal Area Charts, do provide valuable information for terminal operations; however, their purpose is slightly different, typically focusing on visual flight rules operations and specific to visual flight navigation rather than solely for IFR. Sectional Charts offer a broad overview of airspace but lack the intricate details required for IFR operations in congested areas, making them less suitable for this context.