If you head over to Kacha's site he has made available pdf's of the Luftwaffe victory claims for each month in 1945. They're quite detailed.
And from Alfred Price's Luftwaffe Data Book:
Serviceable Aircraft Strength 10 January 1945
Single-engined fighters 1462
Night fighters 808
Ground-attack aircraft 613
Night harassment aircraft 302
Multi-engined bombers 294
Anti-shipping aircraft 83
Long-range reconnaissance aircraft 176
Short-range and army cooperation aircraft 293
Coastal aircraft 60
Transport aircraft 269
Misc. aircraft (KG 200) 206
Total 4566
Serviceable Aircraft Strength on 9 April 1945:
Single-engined fighters 1305
Night fighters 485
Ground-attack aircraft 712
Night harassment aircraft 215
Multi-engined bombers 37
Long-range reconnaissance aircraft 143
Short-range and army cooperation aircraft 309
Coastal aircraft 45
Transport aircraft 10
Misc. aircraft (KG 200) 70
Total 3331
The book has detailed data on almost every unit at the time, but for obvious reasons I can't be bothered to type everything here.
This USAAF site has the USAAF losses detailed:
http://www.usaaf.net/digest/t100.htmTotal USAAF losses in Europe January - August 1945: 4,851 aircraft. About half of what they lost in all of 1944. And that number does not include their losses in the Med.
"In the ETO (non Mediterranean MTO) during 1944, USAAF lost 1,293 fighter aircraft to enemy fighters, while losing 1,611 due to German Flak. In 1945 the ratio of fighters lost to Flak vs Luftwaffe fighters was almost 4:1."If we extrapolate that ratio to include all aircraft that's more than a thousand American aircraft shot down by the Luftwaffe in 1945.
If you don't want to believe it, don't believe it.