Our Company

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Short Overview

Mesotis Jets is a privately held firm created in 2011 by a group of specialists who share vast expertise and experience in all aspects of business aviation.

mesotis Jets turn-key services, photo of flying business jet

From our offices

in Vienna, Long Beach, and Dubai, Mesotis Jets has already established a worldwide network of customers who confide in Mesotis for turn-key services such as:

  • Aircraft Sales and Acquisitions
  • Aviation Consulting
  • Aviation Insurance
  • Aviation Fuel
  • Airplane Financing and Leasing
  • JSSI (Jet Support Services Inc.) Maintenance Cost Control Programs
  • Aviation Consulting
  • Private Charter Sales


Our motivation is based on success — that's why Mesotis Jets assumes full responsibility for aircraft marketing and promotion expenses. There are no up-front or hidden fees.

Benefits included in our service

Long-term relationships are the foundation of our business. Our goal is to facilitate balanced transactions while adhering to the highest business ethics, resulting in a win-win situation for both parties.

  • Legal advice and supervision by a professional Aviation Lawyer
  • Letter of Intent Drafting
  • Negotiations of Purchase Agreements and other contracts
  • Organization of visual inspections at aircraft home bases
  • Cost control for the airworthy discrepancies found during PPI
  • De-registration support
  • Registration of Escrow Account
  • Aircraft Purchase Agreement Drafting
  • Documentation Support
    (Bill of Sale, Warranty Bill of Sale, Insurance Policies etc.)
Mesotis Jets services benefits image, photo of business jet interior

Meet Our Team

Our team continues to gain momentum as we attract clients by providing professional, transparent, and personalized service-driven products while ensuring peace of mind for every customer and partner we interact with along our shared journey.

Jonathan Deutsch

CEO and Founder of Mesotis Jets


An aviation industry professional with more than 10 years of experience in various segments of the aviation sector. Jonathan initially started by selling insurance for JSSI in Europe, North Africa, and the ME until 2008—insuring a portfolio of more than 2 Billion USD in asset value.

Jonathan later built the first Pre-owned aircraft sales department within a major Austrian aviation holding company that manages approximately a billion USD in aircraft value for Austrian banks.From 2008 to 2011, Jonathan also developed a new subsidiary of the company in Africa, placing another 50 million USD in aircraft assets via Purchase Leases and Operating Leases.

In 2011, Jonathan founded Mesotis Jets and later secured an exclusive contract to represent JSSI for the entire African continent.

Thomas Thums

Sales Director for Europe & Partner Accounts


Thomas has more than 15 years of aviation industry experience in various segments of business and cargo aviation, including maintenance management, logistics, aircraft sales, and marketing.

In 2002, he joined an international aviation cargo logistics company as Sales Director, managing 22 international airlines. Thomas also joined a major Austrian aviation holding company in 2009 as a Sales Specialist for JSSI. At that time, he sold contracts worth more than 500 million USD in asset value over a period of two years.

In 2010, he moved to Cessna Aircraft Sales and Marketing, where he sold new airplanes in Europe.

Thomas joined Mesotis in 2014 as the head of aircraft sales and acquisitions in Europe.

Walter Durauer

Director Mesotis Jets Long Beach


Walter has 25 years of aviation experience. He started as a commercial pilot for passenger airlines, cargo, and business aviation companies. He has multiple type ratings, including B737 / CE-500 / Falcon10 / Learjet / N265 Sabreliner and Helicopter 206B.

In 1995, Walter became an aviation consultant and was involved in aircraft sales, acquisition, aircraft detailing, and refurbishment. He joined Mesotis Jets in 2011.

Alexander Morass

Market Analyst


Alexander Morass was born and raised in Brussels. He graduated from the European School of Brussels IV in July 2019. In October 2019, he enrolled in Business & Economics at WU/Vienna.

Alexander joined Mesotis Jets in January 2020 after initially gaining experience through two traineeships during 2017/18. He is currently responsible for Market Development at Mesotis Jets' aircraft sales and acquisitions sector.

Marcel Pepe Ascui

Global Operations Advisor


A multi-industrial relations and policy specialist, Marcel is the company’s global operations authority, managing public relations as well as back-office performance. As part of his upbringing, the aviation sector was a steadfast companion and definitive of Marcel’s future career choices. Having spent his formative professional years as part of Vienna Airport’s documentation and aviation safety corps, his industrial nous is of intricate quality.

Instrumental in leading him to join an international working environment, his skills match the dexterity and vitality that business aviation requires. A polyglot by passion and with a sound understanding of Mesotis Jets’ footprint and potential, he joined the company in 2024.