H.R. 6473 (111^th): Airport and Airway Extension Act of 2010, Part IV

12/22/2010. Amends the Internal Revenue Code to extend through March 31, 2011: (1) increased excise taxes on aviation fuels and the excise tax on air transportation of persons and property; and (2) the expenditure authority for the Airport and Airway Trust Fund. Makes funds available for the six-month period beginning on October 1, 2010, for airport planning and development and noise compatibility planning projects. Prescribes a formula for calculating funding apportionments and meeting certain other requirements for the six-month period, including a 50% reduction in these apportionments and specified other amounts. Extends through March 31, 2011, the authority of the Secretary of Transportation to make airport improvement project (AIP) grants. Extends through March 31, 2011: (1) the pilot programs for passenger facility fee authorizations at non-hub airports; and (2) disclosure requirements for large and medium hub airports applying for AIP grants. Directs the Secretary to extend through March 31, 2011, the termination date of insurance coverage for domestic or foreign-flag aircraft. Grants the Secretary discretionary authority to further extend such coverage through June 30, 2011. Extends through June 30, 2011, the authority of the Secretary to limit air carrier liability for claims arising out of acts of terrorism. Extends through March 31, 2011: (1) grant eligibility for airports located in the Marshall Islands, Micronesia, and Palau; (2) grants to state and local governments for land use compatibility projects under an AIP; and (3) authority for approving an application of the Metropolitan Washington Airport Authority for an airport development project grant or for permission to impose a passenger facility fee. Amends the Vision 100--Century of Aviation Reauthorization Act to extend through March 31, 2011: (1) the temporary increase to 95% of the federal government's share of certain AIP project costs; and (2) funding for airport development at Midway Island Airport.