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In page Optare:

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In 1988 the first full size Optare product appeared, the Delta. This was a single-deck bus based on the DAF SB220 chassis. The Delta bodywork featured contemporary styling and was aluminium with a bolted frame licensed from Alusuisse.[1][2] The Delta successfully found a niche in the full-size single deck bus market, which was very limited at that time. Approaching 370 Deltas were built before production ended in 1998.