Colombian air transportation is well-developed with international airports in Bogot , Barranquilla, Cartagena, Cali and Medell n providing regular flights to major cities abroad. Frequent domestic flights connect principal cities within Colombia. Internal flights are frequently late or several may be combined if there are not enough passengers. There is taxi service available at all major hotels. The workweek is Monday - Friday.
Most commercial offices follow the first system and most manufacturing operations the second.
On the last workday of the month, banks close at noon. 6 p.m. Since 1991, when the foreign exchange control was released, all banks are authorized to exchange foreign currency. There are ATM machines in most banks and modern shopping centers with access to international systems. When paying by cash, it is sometimes possible to negotiate a discount at some stores. Travelers checks are also accepted.