Here's a story as old as the markets: when oil prices spike, airline stocks tend to get a headache. It's happening again right now, and ETF traders are dusting off a classic playbook.

Crude has jumped about 17% over the last month, thanks to escalating tensions in the Middle East, particularly around the crucial Strait of Hormuz. For airlines, that's not just a news headline—it's a direct hit to the bottom line. Most U.S. carriers don't hedge their fuel costs anymore, which means when the price of jet fuel goes up, it flows almost straight into their earnings statements as a higher expense. No buffer, just pain.

So, what's an ETF investor to do? Some are looking at this divergence and seeing a trade.

Airlines Are Feeling the Heat

The most straightforward place to see the impact is in the U.S. Global Jets ETF (JETS). This fund is a pure-play on aviation, holding major airlines like Delta Air Lines Inc (DAL), United Airlines Holdings Inc (UAL), and American Airlines Group Inc (AAL). When fuel spikes and flight routes face disruption, these companies feel the squeeze almost immediately.

For traders who like a little more excitement (and risk), there's the MAX Airlines 3X Leveraged ETNs (JETU). This product magnifies daily moves, which can be a wild ride in a market driven by geopolitical headlines. It's not for the faint of heart.

And it's not just pure airline funds. Even broader transportation exposure isn't a safe haven. The iShares U.S. Transportation ETF (IYT) includes railroads and logistics companies, but airlines still make up a meaningful part of the portfolio, leaving it sensitive to oil shocks and instability.

Energy ETFs Catch a Tailwind

On the other side of this equation, funds tied to oil are enjoying the ride higher. The surge is largely about a "supply-risk premium"—traders are pricing in the possibility that conflict could disrupt the flow of crude.

The United States Oil Fund (USO), which tracks near-term crude oil futures, tends to move quickly when geopolitical risks flare up. For equity exposure, funds like the Energy Select Sector SPDR Fund (XLE) or the Vanguard Energy ETF (VDE) offer a way to play the big integrated oil majors and exploration companies that benefit directly when prices rise.

If you want a global view, the iShares Global Energy ETF (IXC) adds international oil producers to the mix. The common thread is that these funds are moving in the opposite direction of the airline ETFs, and the gap between them is getting wider.

A Tactical Pairs Trade Emerges

That widening gap is where the classic macro trade comes in: going long energy ETFs and short airline ETFs. The logic is simple. As long as crude prices stay elevated, energy producers have pricing power and better margins, while airlines are stuck with a soaring cost they can't easily pass on to customers.

But here's the crucial part: this is a tactical, momentum-driven trade, not a "set it and forget it" long-term allocation. History shows that airline stocks can rebound sharply once oil prices stabilize and flight schedules return to normal. A sudden diplomatic breakthrough or a de-escalation in the Middle East could flip this script very quickly.

For now, the ETF market is telling a clear story. Energy funds are pricing in disruption, while aviation funds are pricing in damage control. Whether that gap continues to widen or snaps shut suddenly might depend less on corporate earnings calls and more on what happens next in global politics.