US stock futures experienced slight fluctuations, swinging between small gains and losses on Tuesday, as investors geared up for the start of the earnings season and kept an eye on the upcoming December Consumer Price Index (CPI) report. In premarket trading, JPMorgan's shares saw an increase of approximately 1.2%, following the release of earnings and revenue figures that surpassed forecasts. In contrast, Bank of New York Mellon's shares dipped by 0.5%, as its financial results did not meet investor expectations. Delta Air Lines faced a steep decline of nearly 6% after it projected adjusted earnings per share for the year at $6.50–$7.50, falling short of analysts' forecast of $7.25. Concurrently, the December CPI report is anticipated to reveal a slight increase in inflation, which is likely to bolster predictions that the Federal Reserve will maintain current interest rates this month. Investors are currently factoring in two potential quarter-point rate cuts within the year, with the first expected to occur in June.