Electric Transit, Inc. (ETI) was a joint venture between the Škoda group in the Czech Republic and AAI Corporation in the United States which made trolleybuses for the Dayton and San Francisco trolleybus systems, constructing a total of 330 trolleybuses. ETI was formed in 1994, and ownership was divided as 65% by Škoda and 35% by AAI. The latter was a wholly owned subsidiary of United Industrial Corporation.