Schubach Aviation, San Diego’s leading on-demand air charter service company, has added a Gulfstream IV private jet to its fleet of 20 luxury aircraft, announced Henry Schubach, president of the firm. The Gulfstream IV is one of the world's most practical large-cabin business jets, boasting an impressive record for technical performance, safety and reliability. A high-speed, high altitude aircraft, the Gulfstream IV...