That used to be a feature. I have 18 different Qantas (eight old & new style, retro and a special liveries. They have unique tail numbers so in reality only four, but I get the same tail number now. Cannot be bothered to do my workaround) liveries and nine different Air New Zealand specials. They did get chosen at random till a performance update broke the randomisation routine. I do now at least get to see my specials again having worked out a solution. 
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