# controller (dumbed down version)

  def email_aircraft
    return unless request.post?
    @request = Request.new(params[:request])
    respond_to do |format|
      if @request.valid?
        flash[:success] = "Your message was successfully sent."
        format.html { redirect_to aircraft_url(@aircraft) }
        format.js
      else
        flash[:error] = AppConfig["error_message"]
        format.html { redirect_to :back }
        format.js
      end
    end
  end

# email_aircraft.js.erb

$("#ajax-response").html("<%= escape_javascript(error_messages_for :request, :header_message => 'Errors were encountered in your request') %>");