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NEW YORK (TheStreet) -- Airline stocks have been among the biggest beneficiaries of lower oil prices, considering that fuel costs are the largest expense for these companies.

With West Texas Intermediate jumping 8% on Friday and climbing above $50 per barrel recently Monday, airline stocks have been getting "crushed," TheStreet's Jim Cramer said on CNBC's "Stop Trading" segment.

Cramer, the co-manager of the Action Alerts PLUS portfolio, pointed out that analysts at Raymond James upgraded Delta Air Lines (DAL) , United Continental Holdings (UAL) and Spirit Airlines (SAVE) to strong buy. 

Delta Air Lines DAL, Spirit Airlines SAVE and United Continental Holdings UAL data by YCharts

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The stocks are rebounding now that oil prices have retreated from the highs. 

But investors should still be careful because a continued rally in oil will likely spell trouble for these stocks, Cramer reasoned. Wait for them to find some support before getting long.

-- Written by Bret Kenwell

Follow @BretKenwell

At the time of publication, Cramer's Action Alerts PLUS had no position in companies mentioned.