You don't know that, in fact the Trump name remained on the airline for several years.
Trump also retained control of several parts of the business for years after.
Trump Airlines, which had the official name of Trump Shuttle, Inc., was an ill-fated venture that lasted from 1989 to 1992. Trump "bought" — and I put that in quotation marks because he didn't pay for it himself, he arranged for a loan of $380 million from a consortium of 22 small banks to finance the transaction — a
profitable division of the troubled Eastern Airlines with operations in the Northeastern United States...
The airline had problems immediately, and
never ended up turning a profit. The loans went into default in September of 1990, less than a year and a half after the airline began operations. While there was an emphasis on luxury fixtures and cutting-edge technology — laptop rentals, anyone? — Trump's failure to understand the needs of his customers, coupled with a massive spike in the price of jet fuel resulting from the first Iraq War, meant that the venture failed spectacularly.
http://www.bustle.com/articles/147006-what-happened-to-trump-airlines-how-the-business-venture-failed-spectacularly-decades-agoBorrowing money to buy a struggling but profitable airline and then losing money on the whole thing is hardly success. It's called losing and he did it bigly.
Here's a much for detailed analysis of the whole fiasco:
http://viewfromthewing.boardingarea.com/2015/10/07/how-donald-trump-bought-and-lost-an-airline/http://viewfromthewing.boardingarea.com/2016/03/17/donald-trump-got-taken-cleaners-buying-trump-shuttle-plaza-hotel/The last one has this interesting bit of info:
Trump only put $20 million of his own money into the airline, and the airline didn’t make nearly enough to service its debt. With no buyers, Trump lost the airline and the banks that had financed the Trump Shuttle deal contracted with US Air to run the operation in 1992. US Air only part-owned the operation (they purchased the remainder in 1997), taking a 40% stake and a 10 year management contract.
Ultimately Trump lost much more than his original investment, forfeiting over $100 million he had personally guaranteed.
Now I'm not an millionaire, but that counts as getting hosed in my book, bigly even.