This would be the dates that the aircraft entered service, not its first test flight or first day of production.
Some of the dates I know have the possibility of being wrong. I searched the web the best I could.
If you have proof of an earlyer or later date please let me know.
When talking about aircraft, it is the sub-varent that we are looking for here. (we all know they used B17's prior to Nov. 1943 but its the
G model in question)

and thank you.
American B-17G (Nov. 1943.)
B-24J (Oct. 1943.)
B-25C (March 1942.)
B-25H (July 1943)
B-26B (Feb 1941)
C-47A (Dec. 1941)
F4F-4 (June 1942)
F4U-1 (Feb. 1943)
F4U-1A (Feb. 1943)
F4U-1C (April 1945)
F4U-1D (April 1944)
F4U-4 (April 1945)
F6F-5 (Sept.. 1943)
FM2 (Aug. 1942)
P-38G (Aug. 1942)
P-38J (Aug. 1943)
P-38L (April 1944)
P-39D (Mar. 1941)
P-39Q (April 1943)
P-40B (April 1941)
P-40E (Dec. 1941)
P-47D-11 (March 1943)
P-47D-25 (May 1944)
P-47D-40 (Aug 1944)
P-47M (Jan. 1945)
P-47N (July 1945)
P-51B (Aug. 1943)
P-51D (Mar. 1944)
SBD-5 (Dec, 1941)
TBM-3 (June 1942)
BritishBoston Mk III (Jan. 41)
Hurricane Mk I (Mar. 1938)
Hurricane Mk IIC (April. 1941)
Hurricane Mk IID (Sept.. 1941)
Lancaster III (March 1942)
Mosquito Mk VI (May 1943)
Seafire Mk II (Oct. 1942)
Spitfire Mk I (Dec. 1938)
Spitfire Mk V (Feb. 1941)
Spitfire Mk VIII (Oct. 1943)
Spitfire Mk IX (April 1943)
Spitfire Mk XIV (April 1944)
Spitfire Mk XVI (Nov 1944)
Tempest Mk V (June 1944)
Typhoon Mk I (Sept. 1941)
FinlandB-239 Brewster (Mar. 1940)
GermanAr 234B (Sept. 1944)
Bf 109E-4 (Jan. 1940)
Bf 109F-4 (Aug. 1941)
Bf 109G-2 (May 1942)
Bf 109G-6 (Feb. 1943)
Bf 109G-14 (July 1944)
Bf 109K-4 (Nov. 1944)
Bf 110C-4b (June 1940)
Bf 110G-2 (Dec. 1942)
Fw 190A-5 (Nov. 1942)
Fw 190A-8 (Feb 1944)
Fw 190D-9 (Aug. 1944)
Fw 190F-8 (Feb. 1944)
Ju 87D-3 (July 1941)
Ju 88A-4 (Feb. 1941)
Me 163 (July 1944)
Me 262 (June 1944)
Ta 152H (Mar. 1945)
ItalianC.202 (July 1941)
C.205 (Feb. 1943)
JapaneseA6M2 (Oct. 1940)
A6M5b (Oct. 1943)
B5N2 (April 1940)
D3A1 (Jan. 1940)
Ki-61-I-KAIc (Jan. 1944)
Ki-67 (July 1944)
Ki-84-la (June 1944)
N1K2-J (June 1944)
RussianI-16 (June 1939)
Il-2 Type 3 (Dec. 1942)
La-5FN (Sept.. 1942)
La-7 (May 1944)
Yak-9T (Mar. 1945)
Yak-9U (April 1944)