After making steep pay cuts during the pandemic, Atlanta-based Delta Air Lines is giving its employees a 4% raise. The salary bumps come as the company tries to fend off unionization efforts and hire enough workers to handle the thousands of travelers returning to the skies. In 2020, when the pandemic caused a 60% drop in air travel, more than 40,000 Delta employees took unpaid leave, and many who continued working saw their hours and pay cut by 25% or more. Their pay was restored to previous levels last year, but this is the first such raise broadly given to Delta employees since 2019. The in…