Business Class and First Class are two premium classes in business aviation that differ in terms of space and seating, privacy, food and beverage service, recreational facilities, priority boarding and lounges, service and treatment.

1. Space and seating

First Class usually offers more space and larger seats that recline backward into lie-flat beds. Business class seats are also relatively spacious, but usually don't lie completely flat.

2. Privacy

First class usually offers a higher degree of privacy, with dividers or screens between seats to provide a more intimate space. Business class seats also offer some privacy, but relatively little.

3. Catering

First class usually offers more sophisticated and varied catering, including multi-course meals, premium ingredients and customized menus. Business class catering is also excellent, but may not be as luxurious and personalized as first class.

4. Entertainment

First class usually offers more entertainment amenities, such as big-screen TVs, personal entertainment systems and more audio-video options. Business class also has entertainment amenities, but they may not be as plentiful as first class.

5. Priority boarding and lounges

First class passengers typically enjoy higher priority, including priority boarding, separate lounges and larger baggage allowance limits. Business class passengers also enjoy some priority, but it may not be as high as first class.

6. Service and treatment

First class passengers typically enjoy more personalized and attentive service, including dedicated attendants, priority check-in and higher levels of service. Business Class passengers also enjoy premium service, but may not be as honored as First Class.