Pre-pandemic, when flights were all full, BA and most carriers overbooked flights, knowing that in most instances the flight would not be oversold at the gate.

Thus, a 100-seat aircraft might sell 110 seats because BA's algorithm suggested that 10 people would not fly. Or, BA might well sell a seat at the full fare and then deny boarding, if necessary, to the cheapest ticket.

Bottom line is that the data would not help you in any material respect.