They would have a serious conflict of interest between getting people on the plane ASAP and checking safety. I already see this when staff are lenient with chec

They would have a serious conflict of interest between getting people on the plane ASAP and checking safety. I already see this when staff are lenient with checking passports and boarding passes. On top of this, most airlines have terrible customer service, so there's no reason to believe they would provide a better service than the TSA. The TSA clearly has many faults, and nor can it take all the credit for the lack of terrorist attacks on US flights. However, it has to get some of the credit. It's wishful thinking to imagine this is a simple problem with a simple fix. If you're going to get rid of the TSA, you're going to have to convince the majority of travellers that the extra convenience is not going to come at the expense of safety.