NSXType-R: If you like airplanes, you're my special friend too :o)
"Aircraft" refers to anything mechanical that can fly (Plane, helicopter, autogyro, glider, etc…). Grammaticaly it is invariable (No "s" at the end in plural).
From a health point of view, I can see that you are lacking the vital minimum, and this is a very serious disease. To cure it, stop at any airport to get to see as many planes as you can and as often as you can. Start smoothly with local airports, take pictures of the static planes, then move onto flying ones at take-off and landing. As your health gets better, increase the size of the airport and the size and number of planes. Once in a while, try an USAF or NAVY base. When you feel a definite improvement, move onto air shows, again starting with local ones, and ending with national ones with a peak at Oshkosh or, better, Midland (Tx) if you like Warbirds especially (CAF Annual Airsho). Shouldn't that be enough, treat yourself with a flight at an aero-club and ask the pilot to fly over your area so that you can take pictures of your home. That should do it :o)
Use a 300 mm tele-lens or zoom (Or equivalent depending if your camera is FX or DX), for aircraft taking off or landing. During air shows, try and push that to about 400 mm using a tele converter 1,4 or 1,7. Remember rule number one: With propeller driven aircraft, never use a speed higher than 1/320s, otherwise your propellers will be frozen and that is ugly (I often try 1/90s or even slower, even if the failure rate is high, but when the picture is good it's fantastic).