Sec. 411. Enforcement of aviation consumer protection rules. Sec. 412. Strollers. Sec. 413. Causes of airline delays or cancellations. Sec. 414. Involuntary changes to itineraries. Sec. 415. Extension of Advisory Committee for Aviation Consumer Protection. Sec. 416. Online access to aviation consumer protection information. Sec. 417. Protection of pets on airplanes. Sec. 418. Advisory committee on air ambulance and patient billing. Sec. 419. Air ambulance complaints to the Department of Transportation. Sec. 420. Report to Congress on air ambulance oversight. Sec. 421. Refunds for other fees that are not honored by a covered air carrier. Sec. 422. Advance boarding during pregnancy . Sec. 423. Consumer complaint process improvement. Sec. 424. Aviation consumer advocate. Sec. 425. TICKETS Act. Sec. 426. Report on availability of lavatories on commercial aircraft. Sec. 427. Consumer protection requirements relating to large ticket agents. Sec. 428. Widespread disruptions. Sec. 429. Passenger rights. Subtitle B—Aviation Consumers with Disabilities Sec. 431. Aviation consumers with disabilities study. Sec. 432. Study on in-cabin wheelchair restraint systems. Sec. 433. Improving wheelchair assistance for individuals with disabilities . Sec. 434. Airline Passengers with Disabilities Bill of Rights. Sec. 435. Sense of Congress regarding equal access for individuals with disabilities. Sec. 436. Civil penalties relating to harm to passengers with disabilities. Sec. 437. Harmonization of service animal standards. Sec. 438. Review of practices for ticketing, pre-flight seat assignments, and stowing of assistive devices for passengers with disabilities. Sec. 439. Advisory committee on the air travel needs of passengers with disabilities. Sec. 440. Regulations ensuring assistance for passengers with disabilities in air transportation. Sec. 441. Transparency for disabled passengers. Subtitle C—Small Community Air Service Sec. 451. Essential air service authorization. Sec. 452. Study on essential air service reform.