My best flight was on April 21st, 2019 when I was going from EDDM-KEWR on Lufthansa’s brand new A350-900. The service was incredible (although an unfair advantage since I was in Premium Economy), the aircraft was so clean, and it was just such an easy, amazing flight.
My worst flight was on December 19, 2019 when I was going from KEWR-KPBI (a flight I am on at least 3 times a year). The flight was scheduled to depart at 9:30pm and as usual, we were delayed by 15 minutes, then 30 minutes, and so on and so forth. At first, there were no announcements and the United app said it was due to technical difficulties. Finally, once 11:15 pm rolled around, we heard that the plane landed from Cancun at 4:30 pm in Terminal B, a standard procedure for international United flights. For some reason, Tech Ops never moved the plane to Terminal C and we didn’t take off until 12:05 am (the next day) and didn’t land until 2:30 am. It was very unfortunate and a poor experience. Good news is I am a 15 year old who isn’t afraid to send an email, so, knowing me, I sent an email to United and got $125 voucher per person, $500 for my family.
Edit: I forgot to mention my horrible flight on December 22nd, 2017 when I was going from LFPG-LLBG on an Air France A321. It was such a disaster and I will never, ever fly Air France again. The gate agents were rude and snarky, the plane was old and disgusting, and what really made me loose it was that my uncle is platinum on Delta (Platinum status with One World as well), and he and my cousins got to bored in group one and we were stuck in group five, even though our tickets were together. Making it even worse, the already rude gate agents told me the overhead bins were full and made us pay to check my carry-on (the bins weren’t full, I checked when I finally boarded). All in all, it was horrible and I will never fly them again, regardless of what people say.