We are scheduled to arrive the week after you return in November. Opposite of you, we usually use AA but booked Delta last year and with cancellation due to Covid, were eventually able to basically restore our original flights without costly overnights. It really is almost impossible to be confident that you will arrive and leave on the times booked for any airline you decide to use. The current federal legislation that has been making the news may assist in flight cancellation and delay accommodations but it's about $ and the airline lobbies are strong so I think finger and toe crossing are likely the best approach next to hitting the lottery.