How can I get a letter of recommendation from a pilot to better help my chances of my Warrant Officer packet going through?

Your chances are not going to improve just because you have a letter from a pilot, especially one that doesn't know you. I would be surprised if a WO would even write one for someone they don't know, in essence they are putting their name on the line for an unknown. Your packet will be much stronger if you have solid letters from your chain of command, platoon/company/battalion. The board understands that not everyone has access to WO and the letters from your chain of command will be more personalized. Good luck.

I am going to offer a slightly different opinion that echos CW5 McQuaid's. Put your packet together completely, have everything done. Once complete take that packet and go to your local airfield. Walk around talk to people, be respectful until you find a warrant officer who is willing to have a conversation with you. Present them with your packet and where you are. Once they review it and interview you they may or may not be willing to write a letter. If not do not give up, it is all about networking and finding the individual that is willing to take an interest in you and provide that letter. Good luck!

I retired 2 years ago but before my retirement a WOFT candidate required a senior Warrant Officer LOR. In the absence of a professional or personal relationship with a CW5 then an interview and a supporting LOR based in the interview was acceptable. There are instructions available from the Warrant Officer Career College to W4s and W5s on how to conduct the interview, what should be asked, how to dig deeper into an answer, and what characteristics the Army would like evaluated during the interview. It's actually surprisingly well done. I have interviewed many but only written 5 positive letters. All five candidates were selected and graduated. Just a hint... If you go this route be prepared. You are being interviewed to determine if you are the candidate that will bring something to Army Aviation if a substantial sum is invested in your training. It's not about improving your paycheck or standard of living.