which aircraft companies have dark grey planes?

Answer 1

United Air Lines' old paint scheme is predominantly dark gray...they're repainting them as time and money allows...

Old Scheme:

http://www.airliners.net/open.file?id=1165898&WxsIERv=Obrvat%20747-422&Wm=0&WdsYXMg=Havgrq%20Nveyvarf&QtODMg=Flqarl%20-%20Xvatfsbeq%20Fzvgu%20Vagreangvbany%20%28Znfpbg%29%20%28FLQ%20%2F%20LFFL%29&ERDLTkt=Nhfgenyvn%20-%20Arj%20Fbhgu%20Jnyrf&ktODMp=Bpgbore%202%2C%202006&BP=1&WNEb25u=X.Y.Lvz&xsIERvdWdsY=A121HN&MgTUQtODMgKE=%5BAvxba%20Q100%20%2F%20Mbbz%3A%20Avxba%2080-400zz%20s%2F4.5%7Es%2F5.6%20RQ%20IE%5D&YXMgTUQtODMgKERD=1088&NEb25uZWxs=2007-01-22%2012%3A02%3A48&ODJ9dvCE=8121&O89Dcjdg=29167%2F1211&static=yes&width=1200&height=810&sok=JURER%20%20%28nveyvar%20YVXR%20%27Havgrq%20Nveyvarf%25%27%20BE%20nveyvar%20YVXR%20%27Fuhggyr%20ol%20Havgrq%25%27%20BE%20nveyvar%20YVXR%20%27Nve%20Pnyvsbeavn%20%28Havgrq%20Nveyvarf%29%25%27%20BE%20nveyvar%20YVXR%20%27Nre%20Yvathf%20%28Havgrq%20Nveyvarf%29%25%27%20BE%20nveyvar%20YVXR%20%27Grq%20%28Havgrq%20Nveyvarf%29%25%27%20BE%20nveyvar%20YVXR%20%27Hagvgyrq%20%28Havgrq%20Nveyvarf%29%25%27%29%20%20BEQRE%20OL%20cubgb_vq%20QRFP&photo_nr=13&prev_id=1165900&next_id=1165501&size=L

New Scheme:

http://www.airliners.net/open.file?id=1165501&WxsIERv=Obrvat%20747-451&Wm=0&WdsYXMg=Havgrq%20Nveyvarf&QtODMg=Ubat%20Xbat%20-%20Purx%20Ync%20Xbx%20Vagreangvbany%20%28UXT%20%2F%20IUUU%29&ERDLTkt=Puvan%20-%20Ubat%20Xbat&ktODMp=Qrprzore%2031%2C%202006&BP=1&WNEb25u=Znex%20Gnat%20-%20UXNRP&xsIERvdWdsY=A105HN&MgTUQtODMgKE=&YXMgTUQtODMgKERD=2038&NEb25uZWxs=2007-01-21%2000%3A35%3A11&ODJ9dvCE=&O89Dcjdg=26473%2F985&static=yes&width=1200&height=810&sok=JURER%20%20%28nveyvar%20YVXR%20%27Havgrq%20Nveyvarf%25%27%20BE%20nveyvar%20YVXR%20%27Fuhggyr%20ol%20Havgrq%25%27%20BE%20nveyvar%20YVXR%20%27Nve%20Pnyvsbeavn%20%28Havgrq%20Nveyvarf%29%25%27%20BE%20nveyvar%20YVXR%20%27Nre%20Yvathf%20%28Havgrq%20Nveyvarf%29%25%27%20BE%20nveyvar%20YVXR%20%27Grq%20%28Havgrq%20Nveyvarf%29%25%27%20BE%20nveyvar%20YVXR%20%27Hagvgyrq%20%28Havgrq%20Nveyvarf%29%25%27%29%20%20BEQRE%20OL%20cubgb_vq%20QRFP&photo_nr=14&prev_id=1165898&next_id=1165440&size=L

Some American Airlines Airbus "products" are painted gray because the factory applies a green primer coating to protect the metal. American Airlines aircraft are normally mostly bare polished metal, though.

http://www.airliners.net/open.file?id=0610695&WxsIERv=Nveohf%20N300O4-605E&Wm=0&WdsYXMg=Nzrevpna%20Nveyvarf&QtODMg=Ybf%20Natryrf%20-%20Vagreangvbany%20%28YNK%20%2F%20XYNK%29&ERDLTkt=HFN%20-%20Pnyvsbeavn&ktODMp=Qrprzore%201992&BP=1&WNEb25u=Senax%20P.%20Qhnegr%20We.&xsIERvdWdsY=A8067N&MgTUQtODMgKE=Jrnef%20pbzcnal%20pbybef%20ba%20yvtug%20tenl.%20Ynaqvat%20ehajnl%2025Y.%20Ebhgvat%20WSX-YNK.&YXMgTUQtODMgKERD=1254&NEb25uZWxs=2004-07-01%2000%3A00%3A00&ODJ9dvCE=&O89Dcjdg=510&static=yes&width=1290&height=812&sok=JURER%20%20%28nvepensg_trarevp%20YVXR%20%27Nveohf%25%27%29%20NAQ%20%28nveyvar%20YVXR%20%27Nzrevpna%20Nveyvarf%25%27%20BE%20nveyvar%20YVXR%20%27Oenavss%20%28Nzrevpna%20Nveyvarf%29%25%27%20BE%20nveyvar%20YVXR%20%27Oenavss%20Vagreangvbany%20Nvejnlf%20%28Nzrevpna%20Nveyvarf%29%25%27%29%20%20beqre%20ol%20cubgb_vq%20QRFP&photo_nr=289&prev_id=0610771&next_id=0610463&size=L

Answer 2

Aircraft companies paint the aircraft in the colors of the AIRLINE companies livery

Answer 3

Grey lines

Answer 4

ASIANA airlines (South Korea).

Answer 5

USAF