Yes, you can take boiled eggs on a plane!
According to the reference, you can bring most solid, packaged foods on a plane, provided they fit comfortably in your carry-on. This includes hard-boiled eggs, along with other food items like bread, cooked meat, candy, cereal, cookies, crackers, chips, dried fruit, nuts, sandwiches, wraps, pizza, pasta, and salads.
Therefore, boiled eggs are perfectly acceptable to bring on a plane.
