The veteran Wall Street law firms Davis Polk & Wardwell and Sullivan & Cromwell have signed contracts worth $650,000 each to provide legal advisory services to the U.S. Treasury Department as it sorts out relief to air carriers amid the coronavirus pandemic, joining Cleary Gottlieb Steen & Hamilton as a federal contractor in the virus era.

U.S. Treasury officials said last month that they were working with Cleary Gottlieb on financial matters involving air carriers. Cleary’s contract, also valued at $650,000, mirrored those signed on May 1 by Davis Polk and Sullivan & Cromwell lawyers. The contracts run for six weeks.