I'd fly in the night before. It only saves you a few bucks to fly in the day of. Flying in the day of is quite stressful, because 1) there could be delays with the flight or baggage ( unless you carry on), 2) you don't know the area, 3) it takes time to get the rental, and 4) LAX and Pomona is quite far, about an hour drive. The last thing you want is a bag full of stress coming into western. Remember, it's going to be a long day, approximately 6 hours. You can do the day of, but it'll be a tight schedule. Personally, I'd opt for the night before, and stay at a decent hotel. This gives you time to rest, calm your nerves, and prepare for the interview. There's no second chance on first impressions, so showing your best is key. BTW, I'll see you on the 15th. Good luck.