Mexico blanket permit requirements - Throughout the years, Mexico CAA has been steady in the requirements they have in place for obtaining a Landing Permit for Part 135 and 121 operations.First, we must address a non-spoken rule about the limited Single Landing permits an operator can obtain, and the Magic number seems to be 5. Officially an operator can obtain only 5 single landing authorization in the lifetime of the company and must apply for a Blanket permit to operate under the good side of the law, however this rule is applied only at some of the main airports like MMUN, MMCZ, MMGL and MMPR.As getting an Indefinite Blanket Permit at Mexico will take quite some time and it will certainly be an investment, as most operators prefer to continue working with Single Landing Authorizations in Mexico.Securing a single landing authorization can take from 2 to 6 hours depending on the airport you are travelling to, once approved it will be verbally granted as no document will be issued until the aircraft has safely landed. It is key to understand that these permits are reviewed on a case-to-case basis.Applying for a Blanket permit in Mexico is currently a lengthy process and the lead time is variable, some operators have received their authorization within 6 to 9 months while other have spend around 18 months working on it.The lead time on the process is based on making sure all the documentation presented to the CAA is updated, correct, and complies with their list of requirements, if one of the documents is expired or does not comply could easily delay the process for another couple of months.It is also important to mention that it is considered as Cabotage to pickup passengers from Mexico that did not flew into the country. If a trip to pickup passengers is being considered it will be important to verify the feasibility of this before the trip is confirmed.