Hi, I'm in need of help finding the registrations of 4 flights I took in North America in July this year. I have had a look at a few sites but have had no luck
The 4 flights are as follows:

UA151 SAN-ORD Sat Jul 7th 10:40pm-04:28am +1 B737-900 (flight number changed from UA376)

UA348 ORD-YYZ Sun Jul 8th 06:32am-08:59am A320

And

AA745 LGA-LAX (via DFW) Fri Jul 20th 12:45pm-5:40pm B737-800 (same aircraft as I stayed onboard whilst stopped at DFW

Thanks in advance for any help