I have a flight tomorrow from FNT - DTW - LAX. The FNT flight leaves @ 8:30am and the DTW flights leaves @ 12:15pm. The DTW-LAX flight has already cleared into first. If I do flynow for a later flight out of FNT (10am) but keep the same DTW-LAX 12:15 flight, will I loose my upgrade/seat assignment on the DTW-LAX flight and have to hope to re-eua?