Though it's common for Amazon to ramp up its shipping center staff in August to prepare for holiday shopping, the magnitude of the hiring spree underscores Amazon's growth when traditional retailers are closing stores - and blaming Amazon for a shift to buying goods online.
Amazon planned to hire thousands of people on the spot. Nearly 40,000 of the 50,000 packing, sorting and shipping jobs at Amazon will be full time. Most of them will count toward Amazon's previously announced goal of adding 100,000 full-time workers by the middle of next year.
On the flip side, Amazon's warehouse jobs provide "decent and competitive" wages and could help build skills.
"Interpersonal team work, problem solving, critical thinking, all that stuff goes on in these warehouses," Carnevale said.
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"They're serious entry-level jobs for a lot of young people, even those who are still making their way through school."
The company is advertising starting wages that range from USD 11.50 an hour in Chattanooga, Tennessee, to USD 13.75 an hour in Kent, Washington, near Amazon's Seattle headquarters.
By comparison, the warehouse store operator Costco raised its minimum wage for entry-level workers last year to USD 13 to USD 13.50 an hour.
Many of the job candidates Wednesday were looking to supplement other income.
Rodney Huffman, a 27-year-old personal trainer, said the USD 13-an-hour job in Baltimore would pay enough to help cover bills while he starts his own company.
"I'm looking to do the night shifts and then run my own company during the day," he said.
While Amazon has attracted attention for deploying robots at some of its warehouses, experts said it could take a while before automation begins to seriously bite into its growing labor force.
Steve King, 47, a job candidate in Fall River, agreed: "I don't think robots are up to snuff yet. I think they will be. Hopefully I can get in before the robots get that good and get above the robots in administration or something."
In recent years, reports have emerged about difficult working conditions at Amazon's warehouses, including deaths at two Amazon warehouses in 2014. The company also came under fire in 2011 for extreme heat at its warehouses that caused "heat-related injuries" among workers.
But those who showed up Wednesday were excited by the prospects of health insurance and other benefits, as well as advancement opportunities.
"I like to be busy, so I know Amazon is busy and they want hard workers," retired police officer Brian Trice said. Trice was among those who stood in line in Baltimore on a hot day, as Amazon contractors passed out bottles of water and an ice cream truck played music nearby. In Fall River, a line snaked out of the warehouse and under a tent.
Amazon is "insatiable when it comes to filling jobs at warehouses," Roberts said. He said Amazon's job offers could also help drive up wages at nearby employers, including grocery stores and fast-food joints.
"It has a relatively healthy effect in the surrounding area," he said.