The aircraft carrying the 66-year-old news anchor hit a lorry on a ring road on Monday morning. The pilot and the co-pilot are also thought to have died.
Tributes have been paid to Boechat, who was an award-winning radio and TV broadcaster with Bandeirantes, or Band.
Breaking the news live on TV, a colleague said it was "a very sad moment for Brazilian journalism".
Boechat had finished recording the popular morning radio show Café com Jornal just hours before the incident.