LeonB1985 From , joined Dec 1969, posts, RR: Reply 1, posted (7 years 9 months 2 weeks 4 days 16 hours ago) and read 1500 times:
Errm - length and consequently passenger capacity. I've always found them relatively easy to tell apart. The -400s have two overwing exits, so can be distinguished from the -300 and -500. The -500 is noticably shorter than the -300. Hope this helps
DFW13L From , joined Dec 1969, posts, RR: Reply 2, posted (7 years 9 months 2 weeks 4 days 16 hours ago) and read 1486 times:
The 737-300 and 400 are similar, but the 400 is a bit longer, and it is actually a bit more rare.
If you look at the engines, it seems to me that each model has the engine a bit more rounded than the last, with the 300 the flattest.
The 737-500 is the shortest of the fleet.
The 737-700 is long, but the 800 is longer than 700 and 900 is longer than 800.
I know that the 800 and 900 have 2 exit doors over each side of the wing, and I'm not sure if the 700 does.
The last time I flew USAirways, I noticed that it looks like the registration of their 737s begins with the series number, such as a 737-300 has registration N305US for example. That may be flawed as I usually don't have much to do with that airline.
Look for a Continental 737-900. That thing is LONG
MtnWest1979 From United States of America, joined Nov 2005, 2282 posts, RR: 1 Reply 3, posted (7 years 9 months 2 weeks 4 days 16 hours ago) and read 1486 times:
Well, the -400 is the only of the 3 with 2 overwing emergency exits, and the -500 seems to normally have 8 windows between starboard front door and first gap in front of wing, whereas -300 seems to usually have 13, I believe.
That's what I have come up with as of now.
Or, WN -500s are N5**SW, WN -300s N3**WN/SW, or N6**WN/SW/AA ,AS -400s are N7**AS , Â
Also, UA -300s I have seen are N2**UA and N3**UA, and their -500s I have seen are N9**UA