ARTICLE 221:

Airports and Auxiliary Services (Aeropuertos y Servicios Auxiliares) will make bimonthly provisional payments no later than the 17th of the months of March, May, July, September and November of the same fiscal year and January of the following, by means of a declaration that will be presented at the offices authorized by the Secretary of Finance and Public Credit (Secretaría de Hacienda y Crédito Público). The provisional payment for the right of use, enjoyment or exploitation of the federal airports will be calculated considering the gross income obtained during the previous two-month period, by the concepts indicated in the previous article.

The right of exercise, deducting the bimonthly provisional payments, will be paid by means of a declaration that will be presented to the offices authorized by Secretary of Finance and Public Credit (Secretaría de Hacienda y Crédito Público), within three months following the close of the fiscal year.

When it is a balance in favor of the Airports and Auxiliary Services (Aeropuertos y Servicios Auxiliares), said balance may accredit it against the provisional payments of the right that is in their charge, for the subsequent exercises to which it is declared, until it is exhausted.