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It means that Six Flags' 18 venues will continue to use both the accesso LoQueueSM virtual queuing solution, sold as THE FLASH Pass, and its Passport ticketing suite.
"This extension follows over a decade of successful partnership with Six Flags and is a reflection of the quality of our solutions and their ability to drive results for our clients and improve experiences for their guests,” said chief executive Tom Burnet.
“We are thrilled to extend this important relationship through 2025, and look forward to continuing to offer Six Flags our world class ticketing and queuing technology."
Last week accesso told investors that its financial results for 2015 will be comfortably in line with expectations, a year in which agreement with Alton Towers and London Eye operator Merlin Entertainments.
It added that 2016 has also got off to a strong start, with all business lines showing good momentum.
Specifically, accesso highlighted that its ShoWare division, which has seen notable early progress with 16 new contract wins.
Meanwhile accesso Siriusware has begun the year with four new contracts; including the West Mountain ski resort in New York State and indoor skydiving venue iFLY Brasilia.
Elsewhere, the accesso LoQueue business is set to launch its mobile solution, called Qsmart, in Asia for the first time. It will be rolled out in June at the Movie Animation Park Studios in Malaysia.
The LoQueue unit also landed an additional agreement with an attraction in North America, for the implementation of its queueing system in 2017.
The shares, up 66% in the last year, added a further 3.84%% in the wake of this morning’s news to change hands for 947.5p each
Northland Capital’s analyst David Johnson told investors: “Six Flags has been an accesso customer for more than 10 years and the extension, coupled with the agreement signed with Merlin in the summer, provides the company with good revenue visibility going forward.
“The shares, now trading at an all-time high, assume considerable additional growth and very strong execution.”