Investing.com-- Stifel analysts downgraded FTAI Aviation Ltd (NASDAQ: FTAI ) on Sunday amid doubts over the sustainability of the company's aerospace engines unit, although they still flagged some potential in the company's capital initiatives. Stifel downgraded FTAI to Hold from Buy, but raised their target price to $123.0 from $100.0. The new target represents a 4% downside from FTAI's Friday close. Stifel noted that the stock had a "wild ride" after the company was hit with a short seller report from Muddy Waters Research, which alleged that the company's financial reporting was "highly misleading." While FTAI had plummeted in January after the report, the stock has since recouped a bulk of these losses, as the aeroplane parts supplier also announced a joint venture initiative to invest about $240 million in mid-life planes. Stifel said that while the initiative did make for "additional color," the brokerage found it hard to maintain a Buy rating on the stock amid uncertainty over its margins.