As kindly requested by AceMedic, I'm posting below approximate service dates (give or take a month or two) for aircraft types included in my FM packages, for those who like to fly historically in WOFFue/pe/bh2.
Happy flying,
Von S
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Fokk. Dr.1 150 hp - Mar. to Oct. 1918 (very rare)
Nieup. 27 165 hp - July to Nov. 1918 (not common; used into 1920s)
late Sopwith Tripe 135 hp - July to Nov. 1917 (with improved elevator; common; use the stock Tripe from late 1916 to about March/April 1917)
2-gun Tripe 142 hp - Sept. 1917 to Jan./Feb. 1918 (very rare)
late Alb. D.II 180 hp - Aug./Sept. 1917 to Nov. 1918 (not common)
field-modded Alb. D.I 170 hp - Mar./Apr. to Oct./Nov. 1917 (not common)
Fokk. E.II(a) 100-105 hp - July/Aug. 1915 to Mar./Apr. 1916 (E.II was best but most difficult handling of Eindecker types)
late Sopwith Pup 100 hp - Jan./Feb. to Nov./Dec. 1917 (not common)
Nieup. 23bis 125 hp - Sept./Oct. 1917 to June/July 1918 (very rare; middle eastern front largely; RFC/RAF only)
Nieup. 28 165 hp - standard service dates (Feb./Mar. to July 1918)
SPAD 7 150 hp - standard service dates (Aug. 1916 to Jan./Feb. 1917)
SPAD 7 180 hp - standard service dates (Mar./Apr. 1917 to Feb./Mar. 1918)
SPAD 7 220 hp - Apr./May to Nov. 1918 (no more than half a dozen or so retrofitted this way; extremely rare)
early Camel 110 hp - June to Nov./Dec. 1917 (not common)
Camel 130 hp - Sept./Oct. 1917 to June/July 1918 (common)
Camel 153 hp - Mar./Apr. 1918 to Aug./Sept. 1918 (not common)
Fokk. D.VII 180 hp - May to June 1918 (not common)
Fok. D.VII (OAW) 195-205 hp - June to Nov. 1918 (common)
OAW-built Fokk. D.VII (BMW) 230 hp - July to Nov. 1918 (not common; replaces the slightly more fragile Fokker-built D.VII(F) BMW 230 hp mount that is stock in WOFF/BH&H2)
Alb. D.III Oeffag 215 hp estimated - Nov./Dec. 1917 to July/Aug. 1918 (common Austrian late Alb. type, uprated to about 220-225 hp max by fall of 1918; later Austrian Albies had top speeds in the mid-190s to low 200s kph range)
Alb D.Va 200 hp - Aug./Sept. to Nov. 1918 (very rare retrofit)
SPAD 13 200 hp - Nov./Dec. 1917 to Feb./Mar. 1918 (not common)
SPAD 13 220 hp - Mar./Apr. to Nov. 1918 (common)
SPAD 13 235 hp - July/Aug. to Nov. 1918
Nieup. 10 80 hp - Apr./May 1915 to Jan./Feb. 1916 (one-seater fighter conversion of two-seater; not common)
Nieup. 11 80 hp - Jan. to Apr./May 1916
Nieup. 16 110 hp - Mar./Apr. to Dec. 1916 (high wing loading and other oddities; somewhat common for summer of '16 before Nieup. 17 begins showing up)
Nieups. 17, 17bis, 23, 24bis, 24, 27 - standard service dates for these Vickers-armed variants (common types)
Bristol Scout Type C - Mar./Apr. to Dec. 1915 (somewhat common; more common than the earlier Type B variant represented by the stock Bristol Scout)
8Ba Hisso.-powered Se5a - Sept./Oct. 1917 to Nov. 1918 (not very common, but best of the Scout Experimentals)
Pfalz D.III and III.a - about Sept. to Dec. 1917 for the D.III, III.a follows to end of war (both types fairly common)
Alb. D.V and uprated D.V - standard service dates (both types somewhat common; not as common as the later D.Va)
Fok. D.VI Siemens-Halske upgrade - about summer of 1918 to end of war (extremely rare upgrade; any variant of the D.VI is largely uncommon; use the stock Fok. D.VI prior to the summer of 1918)
Fok. D.VIII - Oct. and Nov. of 1918 (somewhat uncommon; for summer of 1918 use the stock Fok. E.V instead, which has a slower top speed)
Pfalz A.I - standard service dates (of mid/late 1915; somewhat uncommon)
Pfalz E.III 95hp - standard service dates (of second half of 1915, appeared before the E.I and E.II Pfalz variants, by the way, and is rare; use the stock 100hp E.III for first half of 1916, also rare)
Morane Parasol L early - used from beginning of war to about the end of 1915 (common)
Morane Parasol L late - used for most of 1916/early 1917 (somewhat common; P type, with the spinner, becomes more prevalent by 1916/early 17)
Fokker Dr. 1 early - about Sept. to Nov. of 1917 (somewhat common; suffered from top wing problems/failures)
Fokker Dr. 1 "gaskammer" - about Dec. of 1917 to March/April of 1918 (common)
Benz-powered (early) Alb. D.I 150 hp - about Sept. to early Nov. 1916 (somewhat uncommon; poorer climb rate than on the Mercedes-powered Alb. D.I)
SPAD 17 300 hp - Aug. to Nov. 1918 (very rare; only about 20 or so of the type delivered; similar in shape to the SPAD 13, with a very slightly thicker fuselage)
Aviatik B/B.I (very early) 100-105 hp - used from beginning of war to about Jan./Feb. 1916 (somewhat common; replaces the common, stock Aviatik B.I (early) that has service dates from about the summer of 1915 to about Mar./Apr. 1916 and that, while slightly faster, handles more poorly than the very early B/B.I)
Fokker-built D.VII 195-205 hp - June to Nov. 1918 (common; slightly better performing than the OAW-built 200 hp D.VII but a bit more fragile)