Discounted like it's 9/11. Well, so far at least...

EVER on the hunt for a great bargain, billionaire investor Warren Buffett boosted his company's stake in Delta Air Lines once again, writes Frank Holmes at US Global Investors.

Berkshire Hathaway acquired some 976,000 Delta shares in February for roughly $45.3 million, according to a filing last Monday, raising its total holdings to 17.9 million shares.

This was enough to bring Buffett's ownership of the US long-haul carrier up to more than 11%.

Once a critic of airline stocks, Buffett has become one of their greatest champions, noting the industry's strong fundamentals and the fact that it's protected by an economic moat.

Accumulating shares now appears to be a strategic move to capitalize on lower fuel costs – Brent crude oil is in freefall so far this year – as well as coronavirus-impacted travel, which has depressed airline stock prices. Fuel is one of the biggest expenses for airlines, and those not already hedged to prices could see benefits from lower prices due to the Russia-Saudi Arabia production dispute.

Buffett isn't alone in thinking airlines look like a steal right now. In a note to clients last week, Citigroup analyst Stephen Trent maintained his Buy ratings on Delta, United Airlines and Spirit Airlines, writing that "if coronavirus concerns fade in the coming weeks and the US is able to avoid recession, this scenario could see a recovery in ex-Asia demand, which could lead airline stock prices and earnings streams to stabilize."

What's more, the domestic airline industry could soon receive fiscal stimulus in the wake of the Covid-19 epidemic. Speaking to various business news networks on Friday, National Economic Council director Larry Kudlow hinted that the US government is considering "timely and targeted micro-measures" for certain industries, including airlines, hospitality and agricultural. It's unclear at the moment what those measures might look like.

Kudlow ruled out a large-scale economic stimulus package similar to the one passed in response to the global financial crisis, calling the idea a "budget buster."

As one the most exposed industries to global travel disruptions, airlines have seen a deeper selloff than the market and now look like an attractive bargain.

So far, Covid-19 has had a far greater impact on global airline stocks than the 2002-2003 SARS epidemic did. The chart below shows the daily percentage change of the NYSE Arca Global Airlines Index starting on the day of the first reported incident of either infection – November 15, 2002 in the case of SARS, December 31, 2019 in the case of Covid-19.

Airline stocks found their bottom on the 77th trading day into the SARS epidemic, down approximately 25%. They exceeded that level in close to half the time during the Covid-19 outbreak, falling 25.72% on the 42nd trading day. Airlines were off about 30% as of Thursday's close.

Below is the 14-day relative strength index (RSI) for the airlines index, going all the way back to 2001. It shows that airline stocks right now are the most oversold since September 2001. The RSI hit 13.9 on March 3, the lowest it's been since September 21, 2001, just days after 9/11, when the index was at 7.7.

Obviously there are multiple factors investors should consider, including time period and asset class, but as a general rule, when the RSI falls below 30, it's been a good buy signal, and anything below 20 has been a screaming buy. Buffett presumably knew this before the rest of us.

We may not get a huge spending package, but don't rule out quantitative easing (QE). You can see the amount of money printing the Federal Reserve had to do in the days following the 2008 crisis. The US monetary base, or the overall total circulation of money, exploded from just under $1 trillion pre-crisis to as much as $4 trillion at its peak in mid-2014.

The Fed is unlikely to print money to combat the economic impact of the coronavirus, according to Cornerstone Macro's Melissa Turner, but it may have to do more QE.

"In that case," Turner writes, "something on the order of $500 billion to $1 trillion is probably what the Fed will do."

Last Tuesday, the Fed lowered the interest rate 50 basis points in its first emergency meeting since the crisis more than 10 years ago. The Fed has cut rates between regularly scheduled policy meetings only six times since 1998, and in each instance, it cut rates again at its next meeting – March 17, in this case.

Additional cuts could send short-term yields to 0%, says DoubleLine Capital CEO Jeffrey Gundlach.

"We will see short rates headed toward zero," the billionaire said on CNBC's Halftime Report. "I'm in the camp that the Fed is going to cut rates again."

He's not wrong. On Friday, the nominal yield on the 10-year Treasury plunged below 0.7% for the first time ever as investors sought shelter from the equity selloff. (As of this morning, the 10-year had fallen even further to just 0.57%.) This had the effect of lifting gold prices up nearly 8% last week, its best weekly advance since 2008. The yellow metal's next test is $1700 an ounce.

There could be other deals than airline stocks for bargain hunters. Even before this Monday's plunge, the S&P 500 Index touched 20 on the RSI, only its seventh time to do so since the turn of this century.

According to CLSA, stocks have historically been up 86% of the time 10 trading days following these conditions. That would put us at March 16 if we're using March 2 as day one. We'll see then if the probability holds.

J.P.Morgan strategists seconded the bullish call, advising clients last week to buy the dip.

"We expect the impact of Covid-19 to be temporary and mitigated by broad policy stimulus, even as the virus spread is proving more severe than anticipated," wrote bank analysts in a note. They explained that they had previously been trimming risk from their portfolios over the past couple of months, but now they see "the risk-reward as increasingly skewed to the upside for risky assets and use the current pullback to add back to cyclical exposures at the margin."

The risk may be too high for some investors, in which case I recommend gold as a diversifier. I like to advocate the 10% Golden Rule, with 5% of your portfolio in gold bullion, the other 5% in high-quality gold stocks, mutual funds and ETFs.