Sure, you have Aegis. But without Hawkeye and CEC - which are key to cruise missile defense - Aegis still gives you as much warning time as anything else, which is distance to horizon divided by the speed of the threat, and in the case of a supersonic missile is uncomfortably small.
I know there are some people who argue that the F-35B will provide beyond-the-horizon warning to Aegis, but if they have explained how this is to be done as a practical matter, given the jet's endurance limits and its radar coverage angle, I have not seen it.