The Aviation Safety Network reports 44 people were killed in the 10 fatal commercial passenger and cargo crashes a year ago.
Trump's comment came in response to a new study that showed 2017 was the safest year on record for commercial aviation.
In comparison, there were 16 accidents and 303 deaths in 2016 among airliners.
No major airline crashed a plane, the To70 agency said in its annual report, also published Monday. This is clear from parallel surveys on the online aviation security network portal and the Dutch consulting firm To70, quoted by the BBC.
The number of deaths in 2017 was far lower than 2016. No fatal accidents involving a British airline have happened since the 1980s.
The low number of accidents comes as no surprise, according to ASN President Harro Ranter: "Since 1997 the average number of airliner accidents has shown a steady and persistent decline, for a great deal thanks to the continuing safety-driven efforts by worldwide aviation organisations such as ICAO, IATA, Flight Safety Foundation and the aviation industry".
But the firm warned that, despite increases in safety measures, there might have been a bit of good luck involved in the lower fatalities.
One worry for the future is the many pieces of electronic equipment that passengers carry in luggage because of the risk of fire or the danger of lithium-ion batteries exploding, the report said.
His comments come after Trump on Tuesday morning tweeted: "Since taking office I have been very strict on Commercial Aviation".
There were fewer deaths in 2017 despite an increase in the number of flights.
But Trump was probably referring only to statistics for turbojets, as there were two deadly USA accidents in ASN data a year ago.
The first, in Arkansas on May 1, killed one person. Thus the most deadly air accident of the year - when the Myanmar military transport aircraft Y-8 crashed in June and killed 122 people - is not included in the total statistics.