The terms Very Light Jet (VLJ) or (particularly in the USA) Entry Level Jet (ELJ) are descriptions currently being applied to small jet aircraft which are approved for single-pilot operation. A typical VLJ/ELJ seats less than 10 people and typically has a maximum take-off mass (MTOM) of less than 4,500 kg. Such aircraft have become popular both for private flying by owner-operators and for air taxi work. VLJs are lighter than those to which the term 'business jet' is commonly applied; a typical example is the Cessna Citation Mustang.