The one thing I would caution is: don't let your attention sway. The quickest way to lose that promised class date at Delta is to fail at United.

You won't be doing yourself, your training partners or your instructor any favors if you have an "I'm just biding my time until my Delta class starts" attitude.

Not saying you have that, a professional pilot will put everything into training, but I have seen it at my current job. Those tend to get found out rather quickly.

Congrats!