Shares of Southwest Airlines LUV have declined nearly 24% in the past six months, primarily due to adversities resulting from persistent weakness in air-travel demand and escalating fuel prices.Image Source: Zacks Investment Research Despite improving, air-travel demand continues to be below the pre-pandemic levels. As a result, LUV is suffering substantial loss of revenues. The airline’s operating revenues have decreased 32.2% and 17% in the second and third quarters of 2021, respectively, from their comparable periods in 2019. The already weak travel demand suffered a further setback in the third quarter due to a spike in coronavirus cases induced by the Delta variant. Softness in bookings hurt Southwest’s third-quarter results to the tune of approximately $300 million. The airline estimates lingering effects from the deceleration in bookings witnessed in the third quarter to impact its fourth-quarter operating revenues by approximately $100 million. LUV expects fourth-quarter operating revenues to decline 15-25% from the comparable period’s figure in 2019.The continued weakness in air-travel demand is primarily due to significant lag in business travel recovery. After declining in the lower 60% range in both July and August from the 2019 level, Southwest’s managed business revenues fell 73% in September. By the end of 2021, the airline expects its managed business revenues to be down roughly 60% from the comparable period in 2019. A spike in oil prices is pushing up Southwest’s fuel expenses, which in turn is hurting its already weak bottom line. Fuel costs per gallon, including fuel tax (economic), rose 44.4% year over year to $1.92 in the second quarter. The same jumped 65.9% to $2.04 in the third quarter. LUV estimates economic fuel costs per gallon to be between $2.25 and $2.35 in the fourth quarter. Due to a spike in fuel prices as well as costs associated with ramp up in operations (to cater to the improvement in travel demand), the carrier does not expect to be profitable in the fourth quarter of 2021, as it had previously anticipated.Zacks Rank & Key PicksSouthwest carries a Zacks Rank #3 (Hold).Here are some better-ranked stocks within the broader Transportation sector:Schneider National SNDR sports a Zacks Rank #1 (Strong Buy). The company has a stellar earnings surprise history, having outperformed the Zacks Consensus Estimate in each of the preceding four quarters, the average beat being 21%. You can see the complete list of today’s Zacks #1 Rank stocks here.Shares of Schneider National have rallied more than 25% so far this year.Expeditors International of Washington EXPD also sports a Zacks Rank #1. The company’s earnings have surpassed the Zacks Consensus Estimate in each of the preceding four quarters, the average beat being 29.1%.Shares of Expeditors have appreciated nearly 34% so far this year.Landstar System LSTR carries a Zacks Rank #2 (Buy). The company’s earnings have trumped the Zacks Consensus Estimate in each of the trailing four quarters, the average beat being 11.4%.Shares of Landstar have gained more than 32% so far this year. Bitcoin, Like the Internet Itself, Could Change Everything Blockchain and cryptocurrency has sparked one of the most exciting discussion topics of a generation. Some call it the “Internet of Money” and predict it could change the way money works forever. If true, it could do to banks what Netflix did to Blockbuster and Amazon did to Sears. Experts agree we’re still in the early stages of this technology, and as it grows, it will create several investing opportunities. Zacks’ has just revealed 3 companies that can help investors capitalize on the explosive profit potential of Bitcoin and the other cryptocurrencies with significantly less volatility than buying them directly. See 3 crypto-related stocks now >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Southwest Airlines Co. (LUV): Free Stock Analysis Report Expeditors International of Washington, Inc. (EXPD): Free Stock Analysis Report Landstar System, Inc. (LSTR): Free Stock Analysis Report Schneider National, Inc. (SNDR): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research