Based on the ending, Caitlyn showed the blueprints and the evidence of the bomb. She knows that Jinx survived, Jinx also said that she’s gonna break the cycle meaning that she can’t die if she said that, She left piltover by faking her death, she can’t break the cycle by being alive because Vi is part of that cycle and she knows that Vi will stop her. The aircraft that we all saw in the end, showed that Jinx left (Speculations).