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The Al-Leyans are a civilization which operated Al-Leyan transports from Deep Space 4 to Caere. (Al-Leyan article at ST website: StarTrek.com.)
In the year 2369, Richard Galen offered to take Jean-Luc Picard on an archeological expedition. The proposed journey involved taking an Al-Leyan transport from Deep Space 4 to Caere, after which they'd take a shuttle to Indri VIII. Picard declined the invitation. (TNG episode: "The Chase")