United Parcel Service, Inc. (UPS) is benefiting from solid free cash flow. However, rising expenses are headwinds.Let’s delve deeper.Factors Working in Favor of UPSWe are encouraged by UPS' solid free cash flow. In the first nine months of 2023, it generated free cash flow of $4.9 billion despite the uncertain scenario.  Robust free cash-flow generation by the company is a major positive and is leading to an uptick in shareholder-friendly activities.Notably, UPS paid dividends worth$4 billion in the first ...