Code:

using System;
using System.Collections.Generic;
using System.Text;
using System.Collections.Specialized;
using System.Globalization;
using System.Text.RegularExpressions;

namespace Azuon
{
    class AirArabia : Airline
    {
        protected override string dataStr
        {
            get
            {
                return
@"http://

GetCookie
HEAD www.airarabia.com/home

[no]

[no]

SearchFare
POST reservationsma.airarabia.com/ibe/public/showReservation.action

[no]

hdnCarrier    
hdnDesign    0
hdnLanguage    
hdnParamUrl    

GetJSON
POST reservationsma.airarabia.com/ibe/public/availabilitySearchCalendar.action?requestID=1

[no]

fareQuoteJson    
flexiSelection    
searchParams.departureVariance    3
searchParams.returnVariance    3
searchParams.selectedCurrency    EUR
searchParams.fareType    A
searchParams.searchSystem    INT
searchParams.classOfService    Y
searchParams.firstDeparture    
searchParams.lastArrival    
selectedFlightJson    
searchParams.halfReturnFareQuote    
searchParams.stayOverTimeInMillis    
searchParams.fromAirportSubStation    
searchParams.toAirportSubStation    
searchParams.fareQuoteLogicalCCSelection    
searchParams.quoteOutboundFlexi    true
searchParams.quoteInboundFlexi    true
searchParams.flexiSelected    
";
            }
        }

        public AirArabia()
        {
            name = "Air Arabia";
            code = "G9";
            LUGGAGE_FEE = 0;
            DOUBLE_BOOKING_FEE_FOR_ROUND_TRIP = false;
            paymentMethods = new Dictionary<string, float> {
                { "Visa", 0 },
                { "Mastercard", 0}};
        }

        protected override NameValueCollection getSearchParameters(Query query)
        {
            NameValueCollection pars = new NameValueCollection();
            pars.Add("hdnParamData",
                "EN^AS^" +
                query.origin.code + "^" +
                query.destination.code + "^" +
                query.dates[0].ToString("dd/MM/yyyy", CultureInfo.InvariantCulture) + "^" +
                (query.isRound() ? query.dates[1].ToString("dd/MM/yyyy", CultureInfo.InvariantCulture) : "") + "^" +
                "0^0^EUR^" +
                query.passgs.adults.ToString() + "^" +
                query.passgs.children.ToString() + "^" +
                query.passgs.infants.ToString() + "^" +
                "FROM^TO^" +
                query.isRound().ToString().ToLower());
            return pars;
        }

        protected override bool parseFares(Query query, string html, List<Fare>[] foundFares)
        {
            var pars = new NameValueCollection() {
                { "searchParams.adultCount", query.passgs.adults.ToString() },
                { "searchParams.childCount", query.passgs.children.ToString() },
                { "searchParams.infantCount", query.passgs.infants.ToString() },
                { "searchParams.fromAirport", query.origin.code },
                { "searchParams.toAirport", query.destination.code},
                { "searchParams.departureDate", query.dates[0].ToString("dd/MM/yyyy", CultureInfo.InvariantCulture)},
                { "searchParams.returnDate", query.isRound() ? query.dates[1].ToString("dd/MM/yyyy", CultureInfo.InvariantCulture) : "" },
                { "searchParams.returnFlag", query.isRound().ToString() },
                { "searchParams.fromAirportName", query.origin.name },
                { "searchParams.toAirportName", query.destination.name }
            };

            var json = executeCommand("GetJSON", pars, true);

            var mFare = new Regex(
                "\"calDisplayAmout\":(?<price>[0-9]+)," +
                ".+?" +
                "\"returnFlag\":(?<dir>true|false)," +
                "\"segments\":\\[(?<legs>[^]]+)\\]", RegexOptions.Singleline).Match(json);

            if (!mFare.Success)
            {
                return false;
            }

            while (mFare.Success)
            {
                var isOutbound = mFare.Groups["dir"].Value == "false";
                var fare = new Fare(query, isOutbound);

                const int INFANT_FEE = 30;

                fare.price = Convert.ToSingle(mFare.Groups["price"].Value) * query.passgs.Count() + INFANT_FEE * query.passgs.infants;

                var sLegs = mFare.Groups["legs"].Value;

                // take departure of 1st leg
                var depUnixSeconds = new Regex(
                    "\"departureTimeLong\":(?<num>[0-9]+),").Match(sLegs);

                fare.departTime = Utils.unixStart.AddSeconds(Convert.ToInt64(depUnixSeconds.Groups["num"].Value) / 1000);

                // take arrival of last leg
                var arrUnixSeconds = new Regex(
                    "\"arrivalTimeLong\":(?<num>[0-9]+),", RegexOptions.RightToLeft).Match(sLegs);

                fare.arriveTime = Utils.unixStart.AddSeconds(Convert.ToInt64(arrUnixSeconds.Groups["num"].Value) / 1000);

                var mVia = new Regex(
                    "\"segmentShortCode\":\"\\w\\w\\w[^A-Z]+(?<via>\\w\\w\\w)\"").Match(sLegs);

                var sVia = mVia.Groups["via"].Value;

                if ((isOutbound && sVia != query.destination.code) ||
                    (!isOutbound && sVia != query.origin.code))
                {
                    fare.setVia(sVia);
                }

                foundFares[Convert.ToByte(!isOutbound)].Add(fare);

                mFare = mFare.NextMatch();
            }

            return true;
        }
    }