1. A bird deflector comprising spaced interconnected elements, and an accompanying air replacement apparatus operatively connected to a frontal inlet cowl of a jet engine, said air replacement apparatus continuously receives air flow and directs said air flow via continuously open passages(s) into the frontal inlet of an operating jet engine substantially replacing the total air flow being blocked by the bird deflector elements, said air replacement apparatus continuously open passage(s) comprising one of a frustum having a large forward end, and a small rear end secured to the inlet cowl at the forward end thereof; an inlet cowl formed as a frustum; a cylinder secured at the rear end of the inlet cowl and extended over openings formed in the inlet cowl; or an inlet cowl formed as a cylinder having a perforated flanged forward end, each respectively serving to supplement the air flow through openings between the spaced interconnected elements of the bird deflector to provide the total air flow required by the jet engine for all operating conditions.