The most frequently used airline companies from San Francisco to Los Angeles are generally
Westjet,
Alaska Airlines,
Aeromexico,
JetBlue,
KLM,
Air New Zealand,
Copa Airlines,
Singapore Airlines,
Emirates,
Virgin Atlantic,
American Airlines,
Japan Airlines,
Finnair,
All Nippon Airways,
Air China,
Aer Lingus,
Qantas Airways,
V Australia,
Skywest Airlines,
Iberia,
Avianca,
El Al Israel Airlines,
British Airways,
Asiana Airlines,
Delta Air Lines,
United Airlines,
Hawaiian Airlines
are companies.