Old call letters?

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it’s A 17 letters crossword definition.
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Possible Answers:

MCI.

Last seen on: –The Washington Post Crossword – Mar 19 2020
LA Times Crossword 19 Mar 20, Thursday

Random information on the term “MCI”:

The MCI Group is an independently owned global event, association management and congress management company with headquarters in Geneva, Switzerland.

It offers association, company and brand solutions[buzzword] through offline and online events, meetings, congresses and conferences. Services include analytics, content, creative design and production, destination consulting, digital, production and audio visual, and sustainability.

MCI was founded in 1987 by Roger Tondeur and Ursula Wigert in Geneva, Switzerland. Further expansion was swift and more offices were opened in Europe, the Americas, Asia-Pacific, India, the Middle East and Africa. The company now employs more than 2,300 people in 60 offices in 31 countries worldwide.

MCI’s brand portfolio includes MCI Group; Black Flower Agency; Don’t Believe in Style; Dorier Group; Fair Control; Hagen Invent; Logos Public Affairs; MCI Experience; Network Media Partners; ONE CMG; and Ovation Global DMC.

MCI on Wikipedia