Allegiant Travel Company ALGT reported impressive traffic numbers for the month of June as air-travel demand improved in the United States. With more and more Americans getting jabbed, the picture is rosier on a year-over-year basis as well as on a year-over-two-year basis.Scheduled traffic (measured in revenue passenger miles) surged 87.1% from June 2020 levels. Capacity (measured in available seat miles) for scheduled service increased 37.9% from June 2020 readings.With the traffic surge outweighing capacity expansion, load factor (% of seats filled by passengers) in June expanded 20.4 points to 77.7% from the year-ago period’s levels. For the total system (including scheduled service and fixed fee contract), Allegiant carried more passengers in June 2021, up 88.2% from the June 2020 levels.Compared with June 2019 levels (pre-COVID), traffic and capacity surged 3% and 13.8%, respectively. However, the load factor tanked 8.2 points to 77.7% as increase in traffic was less than capacity expansion. For the total system, the airline carried 1.8% more passengers in June 2021 from June 2019 levels.With oil prices shooting up, Allegiant is witnessing a rise in fuel cost per gallon. The metric, is now expected to be at $2.02 per gallon (previous expectation: $1.99 per gallon) for the second quarter.Besides, the carrier expect its June-end quarter’s scheduled service revenue (excluding fixed fee and other revenue) to be down 1.3% now (previous expectation: down 6-10%) from second-quarter 2019 levels. Total operating revenues are expected to go down 4% from second-quarter 2019 levels. Adjusted EBITDA margin for the quarter is estimated to be approximately at 29%.Zacks Rank & Stocks to ConsiderAllegiant currently carries a Zacks Rank #3 (Hold).Some better-ranked stocks in the broader Zacks Transportation sector are Landstar System LSTR, C.H. Robinson CHRW and FedEx Corporation FDX. All the stocks carry a Zacks Rank #2 (Buy). You can see the complete list of today’s Zacks #1(Strong Buy) Rank stocks here.Long-term (three to five years) expected earnings per share growth rate for Landstar, C.H. Robinson and FedEx is projected at 12%, 9% and 12%, respectively. More Stock News: This Is Bigger than the iPhone! It could become the mother of all technological revolutions. Apple sold a mere 1 billion iPhones in 10 years but a new breakthrough is expected to generate more than 77 billion devices by 2025, creating a $1.3 trillion market. Zacks has just released a Special Report that spotlights this fast-emerging phenomenon and 4 tickers for taking advantage of it. If you don't buy now, you may kick yourself in 2022.Click here for the 4 trades >>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 C.H. Robinson Worldwide, Inc. (CHRW): Free Stock Analysis Report FedEx Corporation (FDX): Free Stock Analysis Report Allegiant Travel Company (ALGT): Free Stock Analysis Report Landstar System, Inc. (LSTR): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research