Donald Trinks is seeing both sides of the labor problem in his restaurant: less business from travelers and not enough workers to capitalize on the business he has left. More people want to eat in his restaurant, Bart’s Drive-In in Windsor, Connecticut, but Trinks has to close on Wednesday and Thursday nights because he can’t find enough workers. At the same time, his catering business is down because business travel has evaporated with the surge of the coronavirus delta variant. “We do a lot of business catering, and there’s a lot less business meetings and people coming in from out of state,...