The SOFES speech database (Spoken Flight Enquiries in Slovene) is a collection of transcribed and segmented audio recordings of spoken flight-information enquiries in Slovene. SOFES is built on the basis of the GOPOLIS speech database, which was acquired and compiled by the members of LUKS at the Faculty of Electrical Engineering, University of Ljubljana in the period 1996–1998. The main purpose of the GOPOLIS speech database was the development of an automatic spoken-dialogue system for users who are enquiring about flight information over the telephone. The content of SOFES is, however, sufficiently diverse to allow for the development of more generalized acoustic models of spoken Slovene, which are the key components of various speech technologies, such as speech recognizers and speech synthesizers, as well as biometric speaker-recognition systems, etc.