"Oil and airlines, they don't mix. Jet fuel is the No. 1 cost for the airlines, so they shouldn't be able to rally at the same time — unless it's their stocks we are talking about," the "Mad Money" host said. "I keep highlighting the bizarrely bullish ways that stocks are trading and sometimes they're totally in your face, like this simultaneous move in the price of oil and the airline stocks."
Delta's top- and bottom-line earnings beat drew buyers out of the woodwork after the market had decided that the airline stocks were overvalued due to growing competition.
In its report, Delta pushed back against the notion that rising costs and airline "fare wars" were putting pressure on its business. Shares of Delta were up 4.8 percent as of Thursday's close.
Delivering 4 percent higher fares per seat per mile versus last year, Delta flaunted its revived price discipline, making Cramer even more bullish on the airline's prospects.
"Given its profitable growth, the stock is way too cheap, trading at a minuscule nine times next year's earnings," the "Mad Money" host said. "The pin action from the amazing Delta quarter was so strong that ... United Continental and American also saw their stocks rally nearly 5 percent."
Cramer said that typically, this kind of move in oil makes hedge fund managers instantly short the airline stocks, betting that they'll be hurt by rising fuel costs.
Instead, stocks in both sectors are surging in tandem, with even the worst of the oil names showing signs of strength.
And it's not like the market has forgotten the effects of rising oil prices on the airlines — shares of Boeing also got a boost because airlines can buy new jets that use less fuel from Boeing to lower their fuel costs.
Strange, unison moves like these have become a theme in what Cramer has dubbed the bull market "in beast mode."
"To borrow a line from F. Scott Fitzgerald, the test of a first-rate market is the ability to hold two opposing rallies at the same time," the "Mad Money" host said. "That's something this wonderful market keeps doing with aplomb. I say get used to it."