With Warren Buffett's Berkshire Hathaway (BRK.A) recently disclosing an increase to its overall airline exposure, making the firm a number one or two holder for each of the "Big 4," Morgan Stanley polled investors and found that about 60% do not expect this to be a step towards a full-scale acquisition. However, analyst Rajeev Lalwani said the prospect of Berkshire buying an airline is a possibility that is "not worth dismissing," citing the historical precedent of Buffett's involvement in the rail industry and eventual deal to buy Burlington Northern SantaFe in 2009. The top four U.S. airlines include American Airlines (AAL), Delta Air Lines (DAL), Southwest (LUV) and United Continental (UAL).

Barnes Group is up 7.8%, or $2.59 to $35.98.

DA Davidson analyst Matt Summerville upgraded Barnes Group to Buy from Neutral with a price target of $45, up from $35.