So much grieves on this thread that I have created. After reading much about Air Law, flight plan is required to flight operations within controlled airspace. Rules 29, 31(flight plan and atc clearance) and 32. Outside controlled airspace are rules 29 and 30.
I know I don't have enough experience and knowledge about the requirements. I'm writing on this lion's den (ATC) hoping to get solutions from professionals and to compare what I read/research at home is correct. I have to be thick skin using this pprune again. I will continue to use this website if I have any questions that I cannot answer by myself. It's better to be right than wrong. I focus on what is right rather than who is right.
Peace, seniors. No more arguing.