Table 3-3 three "non-SI alternative units permitted for temporary use with the SI": the foot (for vertical distance = altitude), the knot (for speed), and the nautical mile (for long distance). Kerosene tax Article 24 of the Chicago Convention stipulates that when flying from one contracting state to another, the kerosene that is already on board aircraft may not be taxed by the state where the aircraft lands, nor by a state through whose airspace the aircraft has flown. This was intended prevent double taxation. However, there is no tax regulation in the Chicago Convention to refuelling the aircraft before departure. The Chicago Convention does not preclude a kerosene tax on domestic flights and on refueling before international flights. Although the ICAO has produced various policy documents suggesting that no taxes of any kind should be placed on aviation fuel, none of these are legally binding, and they are not found in the Chicago Convention itself. Although there are numerous bilateral agreements, so-called 'air services agreements', which make more extensive agreements, including often tax exemption when refueling an aircraft that has come from another contracting state, these are independent from the Chicago Convention; moreover, some air services agreements do allow for the taxation of fuels. See also International Civil Aviation Day Notes References Bibliography Paul Michael Krämer, Chicago Convention, 50th Anniversary Conference, Chicago, October 31 – November 1, 1994. Zeitschrift für Luft und Weltraumrecht 1995, S. 57. External links Convention on International Civil Aviation (9th edition), International Civil Aviation Organization, 2006 Annexes 1 to 18 - Convention on International Civil Aviation, International Civil Aviation Organization, 2007 The Postal History of ICAO : The Chicago Convention 1944 in aviation Aviation law Treaties concluded in 1944 Treaties entered into force in 1947 1944 in Illinois Treaties of the Kingdom of Afghanistan Treaties of Albania Treaties of Algeria Treaties of Andorra Treaties of the People's Republic of Angola Treaties of Antigua and Barbuda Treaties of Argentina Treaties of Armenia Treaties of Australia Treaties of Austria Treaties of Azerbaijan Treaties of the Bahamas Treaties of Bahrain Treaties of Bangladesh Treaties of Barbados Treaties of Belarus Treaties of Belgium Treaties of Belize Treaties of the Republic of Dahomey Treaties of Bhutan Treaties of Bolivia Treaties of Bosnia and Herzegovina Treaties of Botswana Treaties of the Second Brazilian Republic Treaties of Brunei Treaties of the People's Republic of Bulgaria Treaties of Burkina Faso Treaties of Burundi